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Faculty of Engineering and Information Sciences - Papers: Part A

Properties

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Full-Text Articles in Social and Behavioral Sciences

Characterization And Mechanical Properties Of Α-Al2o3 Particle Reinforced Aluminium Matrix Composites, Synthesized Via Uniball Magneto-Milling And Uniaxial Hot Pressing, Buraq Talib Shalash Al-Mosawi, David Wexler, Andrzej Calka Jan 2017

Characterization And Mechanical Properties Of Α-Al2o3 Particle Reinforced Aluminium Matrix Composites, Synthesized Via Uniball Magneto-Milling And Uniaxial Hot Pressing, Buraq Talib Shalash Al-Mosawi, David Wexler, Andrzej Calka

Faculty of Engineering and Information Sciences - Papers: Part A

Al-based composite powders containing 2, 4, 7 and 10 volume fraction of α-Al2O3 were prepared using the uniball controlled magneto-milling method and were then uniaxially hot pressed at (600 ± 10)°C under 70 MPa for 15 min. The resulting composites were greater than 99% theoretical density with enhanced mechanical properties. Detailed characterization was performed using: X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, electrical conductivity, compression, ultra-micro indentation testing and pin on drum wear testing at ambient temperature. Microstructure-mechanical property correlations were obtained as functions of α-Al2O3 volume fraction. It was found ...


Incorporating Environmental Evaluation And Thermal Properties Of Concrete Mix Designs, Mehdi Robati, Timothy J. Mccarthy, Georgios Kokogiannakis Jan 2016

Incorporating Environmental Evaluation And Thermal Properties Of Concrete Mix Designs, Mehdi Robati, Timothy J. Mccarthy, Georgios Kokogiannakis

Faculty of Engineering and Information Sciences - Papers: Part A

One of the main challenges in sustainable design of buildings is to improve the energy efficiency of the building during its lifetime along with reducing the environmental impact of the design. Recent advances in concrete technology offer lower embodied emission through the application of supplementary cementitious materials and recycled aggregates. There are also improvements to thermal properties with the application of admixtures. However, the relationships between the environmental impact (Cradle to Gate) and thermal performance of concrete mix designs have not been researched adequately. The Green House Gas (GHG) emissions associated with each individual concrete component and its production need ...


Functorial Properties Of Putnam's Homology Theory For Smale Spaces, Robin J. Deeley, D. Brady Killough, Michael F. Whittaker Jan 2016

Functorial Properties Of Putnam's Homology Theory For Smale Spaces, Robin J. Deeley, D. Brady Killough, Michael F. Whittaker

Faculty of Engineering and Information Sciences - Papers: Part A

We investigate functorial properties of Putnam's homology theory for Smale spaces. Our analysis shows that the addition of a conjugacy condition is necessary to ensure functoriality. Several examples are discussed that elucidate the need for our additional hypotheses. Our second main result is a natural generalization of Putnam's Pullback Lemma from shifts of finite type to non-wandering Smale spaces.


Microstructure And Mechanical Properties Of Strip Cast Trip Steel Subjected To Thermo-Mechanical Simulation, Zhiping Xiong, Andrii Kostryzhev, Liang Chen, Elena V. Pereloma Jan 2016

Microstructure And Mechanical Properties Of Strip Cast Trip Steel Subjected To Thermo-Mechanical Simulation, Zhiping Xiong, Andrii Kostryzhev, Liang Chen, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

Instead of hot rolling and cold rolling followed by annealing, strip casting is a more economic and environmentally friendly way to produce transformation-induced plasticity (TRIP) steels. According to industrial practice of strip casting, rapid cooling in this work was achieved using a dip tester, and a Gleeble 3500 thermo-mechanical simulator was used to carry out the processing route. A typical microstructure of TRIP steels, which included ~0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite, was obtained. The effects of deformation (0.41 reduction) above non-recrystallisation temperature, isothermal bainite transformation temperature and the size of second phase ...


Fibre Bragg Grating Sensing Technology For The Evaluation Of Physical Properties Of Dental Resin Composites, Ginu Rajan, Paul Shouha, Ayman Ellakwa, Jiangtao Xi, Gangadhara B. Prusty Jan 2016

Fibre Bragg Grating Sensing Technology For The Evaluation Of Physical Properties Of Dental Resin Composites, Ginu Rajan, Paul Shouha, Ayman Ellakwa, Jiangtao Xi, Gangadhara B. Prusty

Faculty of Engineering and Information Sciences - Papers: Part A

The characterization of the physical properties of dental resin composites is fraught with difficulties relating to significant intra and inter test parameter variabilities and is relatively time consuming and expensive. The main aim of this study was to evaluate whether optical fibre Brag grating (FBG) sensing system may become a viable tool to study dental material characteristics. Of particular focus was the potential for the system to demonstrate a multi parameter all-in-one feature. A miniature FBG was embedded in six different dental resin composites and employed as a sensor to evaluate linear polymerization shrinkage, thermal expansion and water sorption. This ...


Effect Of Deformation On Microstructure And Mechanical Properties Of Dual Phase Steel Produced Via Strip Casting Simulation, Zhiping Xiong, Andrii Kostryzhev, Nicole Stanford, Elena V. Pereloma Jan 2016

Effect Of Deformation On Microstructure And Mechanical Properties Of Dual Phase Steel Produced Via Strip Casting Simulation, Zhiping Xiong, Andrii Kostryzhev, Nicole Stanford, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

The strip casting is a recently appeared technology with a potential to significantly reduce energy consumption in steel production, compared to hot rolling and cold rolling. However, the quantitative dependences of the steel microstructure and mechanical properties on strip casting parameters are unknown and require investigation. In the present work we studied the effects of strain and interrupted cooling temperature on microstructure and mechanical properties in conventional dual phase steel (0.08C-0.81Si-1.47Mn-0.03Al wt%). The strip casting process was simulated using a Gleeble 3500 thermo-mechanical simulator. The steel microstructures were studied using optical, scanning and transmission electron microscopy ...


Mechanical Properties And Tribological Behavior Of Aluminum Matrix Composites Reinforced With In-Situ Alb2 Particles, Linlin Yuan, Jingtao Han, Jing Liu, Zhengyi Jiang Jan 2016

Mechanical Properties And Tribological Behavior Of Aluminum Matrix Composites Reinforced With In-Situ Alb2 Particles, Linlin Yuan, Jingtao Han, Jing Liu, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

Aluminum matrix composites (AMCs) reinforced with in-situ AlB2 particles have been fabricated using a combination of powder metallurgy, hot rolling and solution treatment. The effects of boron content (7 and 12 wt%), hot rolling and heat treatment parameters on the microstructures and mechanical properties of the composites were investigated by means of scanning electron microscopy (SEM), tensile test and micro-hardness measurements. The friction coefficient, wear behavior and scratch morphology of the AMCs and pure aluminum were also studied using scratch tests. The hardness and wear properties are higher in a case of composites when compared to unreinforced matrix material.


Enhanced Mechanical Properties Of Arb-Processed Aluminum Alloy 6061 Sheets By Subsequent Asymmetric Cryorolling And Ageing, Hai Liang Yu, Lihong Su, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Jintao Li, Ajit R. Godbole, Charlie Kong Jan 2016

Enhanced Mechanical Properties Of Arb-Processed Aluminum Alloy 6061 Sheets By Subsequent Asymmetric Cryorolling And Ageing, Hai Liang Yu, Lihong Su, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Jintao Li, Ajit R. Godbole, Charlie Kong

Faculty of Engineering and Information Sciences - Papers: Part A

Grain size and precipitations affect the strength and ductility of ultrafine-grained materials. In this study, aluminum alloy 6061 sheets were fabricated using the accumulative roll bonding (ARB) technique. The ARB-processed sheets were subsequently subjected to cryorolling and asymmetric cryorolling. The sheets were further aged at 100 °C for 48 h. Mechanical tests show that a combination of asymmetric cryorolling and ageing results in significant improvement in both the ductility and the strength of the ARB-processed sheets. The microstructures of the sheets at different stages of the process were also analyzed using optical microscopy, scanning electron microscopy, transmission electron microscopy and ...


Microstructures And Mechanical Properties Of Trip Steel Produced By Strip Casting Simulated In The Laboratory, Zhiping Xiong, Andrii Kostryzhev, Ahmed A. Saleh, Liang Chen, Elena V. Pereloma Jan 2016

Microstructures And Mechanical Properties Of Trip Steel Produced By Strip Casting Simulated In The Laboratory, Zhiping Xiong, Andrii Kostryzhev, Ahmed A. Saleh, Liang Chen, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

Conventional transformation induced plasticity (TRIP) steel (0.17C-1.52Si-1.61Mn-0.03Al, wt%) was produced via strip casting technology simulated in the laboratory. Effects of holding temperature, holding time and cooling rate on ferrite formation were studied via analysis of the continuous cooling transformation diagram obtained here. A typical microstructure for conventional TRIP steels consisting of ~ 0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite was obtained. However, coarse prior austenite grain size of ~80 μm led to large polygonal ferrite grain size of ~17 μm, coarse second phase regions of ~21 μm size, small amount of retained ...


Special Rolling Techniques For Improvement Of Mechanical Properties Of Ultrafine-Grained Metal Sheets: A Review, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit R. Godbole, Shi-Hong Zhang Jan 2016

Special Rolling Techniques For Improvement Of Mechanical Properties Of Ultrafine-Grained Metal Sheets: A Review, Hai Liang Yu, Cheng Lu, Anh Kiet Tieu, Hui Jun Li, Ajit R. Godbole, Shi-Hong Zhang

Faculty of Engineering and Information Sciences - Papers: Part A

Interest in ultrafine-grained (UFG) materials has grown rapidly in past 20 years. This review focuses on the application of special rolling techniques for improvement of the mechanical properties of UFG metal sheets. These techniques include asymmetric rolling, cryorolling, asymmetric cryorolling, cross-accumulative roll bonding, and skin-pass rolling. The techniques also include a combination of processes such as equal channel angular press and subsequent rolling, combined high-pressure torsion and subsequent rolling, as well as combined accumulative roll bonding and subsequent asymmetric rolling. We also discuss the main mechanisms leading to improvement in the ductility of UFG materials related to the special rolling ...


The Effects Of Vacuum Annealing Temperatures On The Microstructure, Mechanical Properties And Electrical Resistivity Of Mg-3al-1zn Alloy Ribbons, Fenghua Chen, Qingxue Huang, Zhengyi Jiang, Jingwei Zhao, Binyu Sun, Yugui Li Jan 2015

The Effects Of Vacuum Annealing Temperatures On The Microstructure, Mechanical Properties And Electrical Resistivity Of Mg-3al-1zn Alloy Ribbons, Fenghua Chen, Qingxue Huang, Zhengyi Jiang, Jingwei Zhao, Binyu Sun, Yugui Li

Faculty of Engineering and Information Sciences - Papers: Part A

This paper investigates the influence of vacuum annealing temperature on the microstructure, mechanical properties and electrical resistivity of Mg-3Al-1Zn rapid solidification (RS) magnesium ribbons. The results indicate that when the annealing temperature is increased, the grain size of the ribbons is dramatically reduced from 10 to 1 μm. The highest break stress and micro-hardness is obtained at 673 K. These effects are ascribed to the dispersion strengthening caused by the high amount of fine nanoparticles distributed in the material. Electrical resistivity-temperature (ρ-T) curves have been used to provide useful information about the effects of the annealing temperature on the grain ...


Enhanced Tensile Properties Of Aluminium Matrix Composites Reinforced With Graphene Encapsulated Sic Nanoparticles, Alireza Fadavi Boostani, S Tahamtan, Zhengyi Jiang, Dongbin Wei, Siamak Yazdani, R Azari Khosroshahi, R Taherzadeh Mousavian, Jianzhong Xu, X M. Zhang, Dianyao Gong Jan 2015

Enhanced Tensile Properties Of Aluminium Matrix Composites Reinforced With Graphene Encapsulated Sic Nanoparticles, Alireza Fadavi Boostani, S Tahamtan, Zhengyi Jiang, Dongbin Wei, Siamak Yazdani, R Azari Khosroshahi, R Taherzadeh Mousavian, Jianzhong Xu, X M. Zhang, Dianyao Gong

Faculty of Engineering and Information Sciences - Papers: Part A

Due to a high propensity of nano-particles to agglomerate, making aluminium matrix composites with a uniform dispersion of the nano-particles using liquid routes is an exceptionally difficult task. In this study, an innovative approach was utilised to prevent agglomeration of nano-particle by encapsulating SiC nano-particles using graphene sheets during ball milling. Subsequently, the milled mixture was incorporated into A356 molten alloy using non-contact ultrasonic vibration method. Two different shapes for graphene sheets were characterised using HRTEM, including onion-like shells encapsulating SiC particles and disk-shaped graphene nanosheets. This resulted in 45% and 84% improvement in yield strength and tensile ductility, respectively ...


Time-Dependent Mechanical Properties Of Tough Ionic-Covalent Hybrid Hydrogels, Hai Xin, Hugh Ralph Brown, Sina Naficy, Geoffrey M. Spinks Jan 2015

Time-Dependent Mechanical Properties Of Tough Ionic-Covalent Hybrid Hydrogels, Hai Xin, Hugh Ralph Brown, Sina Naficy, Geoffrey M. Spinks

Faculty of Engineering and Information Sciences - Papers: Part A

Hybrid gels featuring interpenetrating covalent and ionic crosslinked networks have recently been shown to exhibit both high toughness and recoverability of strain-induced network damage. The high toughness results from the energy dissipated as entropically strained network strands are released by the dissociation of ionic crosslinks. As in the so-called double network hydrogels, the toughening process is inherently linked to network damage. This damage, however, can be recovered to a large degree in hybrid gels due to the reformation of ionic associations when the gel is unloaded. The stability of the ionic network under load is here investigated and it is ...


The Effect Of Geometry And Material Properties On The Performance Of A Small Hydraulic Mckibben Muscle System, Danial Sangian, Sina Naficy, Geoffrey M. Spinks, Bertrand Tondu Jan 2015

The Effect Of Geometry And Material Properties On The Performance Of A Small Hydraulic Mckibben Muscle System, Danial Sangian, Sina Naficy, Geoffrey M. Spinks, Bertrand Tondu

Faculty of Engineering and Information Sciences - Papers: Part A

Fluidic McKibben artificial muscles are one of the most popular biomimetic actuators, showing similar static and dynamic performance to skeletal muscles. In particular, their pneumatic version offers high-generated force, high speed and high strain in comparison to other actuators. This paper investigates the development of a small-size, fully enclosed, hydraulic McKibben muscle powered by a low voltage pump. Hydraulic McKibben muscles with an outside diameter of 6 mm and a length ranging from 35 mm to 80 mm were investigated. These muscles are able to generate forces up to 26 N, strains up to 23%, power to mass of 30 ...


A Combined Experimental-Numerical Approach For Determining Mechanical Properties Of Aluminum Subjects To Nanoindentation, Mao Liu, Cheng Lu, A Kiet Tieu, Ching-Tun Peng, Charlie Kong Jan 2015

A Combined Experimental-Numerical Approach For Determining Mechanical Properties Of Aluminum Subjects To Nanoindentation, Mao Liu, Cheng Lu, A Kiet Tieu, Ching-Tun Peng, Charlie Kong

Faculty of Engineering and Information Sciences - Papers: Part A

A crystal plasticity finite element method (CPFEM) model has been developed to investigate the mechanical properties and micro-texture evolution of single-crystal aluminum induced by a sharp Berkovich indenter. The load-displacement curves, pile-up patterns and lattice rotation angles from simulation are consistent with the experimental results. The pile-up phenomenon and lattice rotation have been discussed based on the theory of crystal plasticity. In addition, a polycrystal tensile CPFEM model has been established to explore the relationship between indentation hardness and yield stress. The elastic constraint factor C is slightly larger than conventional value 3 due to the strain hardening.


Effects Of Grain Boundaries In Oxide Scale On Tribological Properties Of Nanoparticles Lubrication, Xianglong Yu, Zhengyi Jiang, Jingwei Zhao, Dongbin Wei, Cunlong Zhou, Qingxue Huang Jan 2015

Effects Of Grain Boundaries In Oxide Scale On Tribological Properties Of Nanoparticles Lubrication, Xianglong Yu, Zhengyi Jiang, Jingwei Zhao, Dongbin Wei, Cunlong Zhou, Qingxue Huang

Faculty of Engineering and Information Sciences - Papers: Part A

The characters of grain boundaries in oxide layers formed on substrates influence adhesion and friction behaviour, surface fracture and wear during high temperature steel processing. In this work, an electron backscattered diffraction (EBSD) analysis was conducted to investigate the role of surface grain boundary and orientation in magnetite (Fe3O4)/haematite (α-Fe2O3) scale during hot rolling, and further evaluate their effects on tribological properties of water-based nanoparticles lubrication. The results demonstrate that Fe3O4 (100) plane is strongly sensitive to the surface characteristics as the minimisation of surface energy. Coincident site lattice (CSL ...


Effect Of Pre-Quenching Process On Microstructure And Mechanical Properties In A Nb-Microalloyed Low Carbon Q-P Steel, Jun Zhang, Hua Ding, Jingwei Zhao Jan 2015

Effect Of Pre-Quenching Process On Microstructure And Mechanical Properties In A Nb-Microalloyed Low Carbon Q-P Steel, Jun Zhang, Hua Ding, Jingwei Zhao

Faculty of Engineering and Information Sciences - Papers: Part A

A refined microstructure consisting of martensite and retained austenite at room temperature has been produced in a Nb-microalloyed low carbon Si-Mn steel by a novel heat-treatment, pre-quenching prior to quenching and partitioning processes (Q&Q-P). The results showed that compared with the conventional quenching and partitioning steel the mechanical properties of steel obtained by the novel treatment have been significantly improved, with a good combination of ultimate tensile strength (1000MPa) and total elongation (above 30%). Meanwhile, the volume fraction of retained austenite has been increased. It was found that the improvement of mechanical properties was mainly attributed to the enhanced ...


Thermal Stability And Properties Of Deformation-Processed Cu-Fe In Situ Composites, Keming Liu, Zhengyi Jiang, Jingwei Zhao, Jin Zou, Lei Lu, Deping Lu Jan 2015

Thermal Stability And Properties Of Deformation-Processed Cu-Fe In Situ Composites, Keming Liu, Zhengyi Jiang, Jingwei Zhao, Jin Zou, Lei Lu, Deping Lu

Faculty of Engineering and Information Sciences - Papers: Part A

This paper investigated the thermal stability, tensile strength, and conductivity of deformation-processed Cu-14Fe in situ composites produced by thermo-mechanical processing. The thermal stability was analyzed using scanning electronic microscope and transmission electron microscope. The tensile strength and conductivity were evaluated using tensile-testing machine and micro-ohmmeter, respectively. The Fe fibers in the deformation-processed Cu-14Fe in situ composites undergo edge recession, longitudinal splitting, cylinderization, break-up, and spheroidization during the heat treatment. The Cu matrix experiences recovery, recrystallization, and precipitation phase transition. The tensile strength and conductivity first increase with increasing temperature of heat treatment, reach peak values at different temperatures, and then ...


Fatigue Properties Of Intact Sandstone In Pre And Post-Failure And Its Implication To Vibratory Rock Cutting, M N. Badge, Shivakumar Karekal Jan 2015

Fatigue Properties Of Intact Sandstone In Pre And Post-Failure And Its Implication To Vibratory Rock Cutting, M N. Badge, Shivakumar Karekal

Faculty of Engineering and Information Sciences - Papers: Part A

The pre-and post-failure fatigue properties of intact sandstone subjected to uni-axial cyclical loading in the laboratory is presented with its possible implication to vibratory rock cutting. The fatigue results subjected to sinusoidal, ramp and square waveforms at cyclic loading frequency of 5 Hz and peak amplitude of 0.05 mm is discussed herewith. It is observed that fatigue behaviour is a function of the dynamic energy of the load and the shape of the waveform. From the presented results, the practical significance of the behaviour of rock and rock masses within the excavation systems subjected to cyclic loads, especially in ...


The Effect Of Processing Parameters On The Microstructure And Mechanical Properties Of Low-Si Transformation-Induced Plasticity Steels, Fayez Alharbi, Azdiar A. Gazder, Andrii Kostryzhev, Bruno C. De Cooman, Elena Pereloma Jan 2014

The Effect Of Processing Parameters On The Microstructure And Mechanical Properties Of Low-Si Transformation-Induced Plasticity Steels, Fayez Alharbi, Azdiar A. Gazder, Andrii Kostryzhev, Bruno C. De Cooman, Elena Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

A base low Si, high-A1 transformation-induced plasticity (TRIP) steel and one with 0.03Nb and 0.002Ti (wt percent) additions were subjected to thermo-mechanical processing (TMP) and galvanising simulations. T


Relating Rejection Of Trace Organic Contaminants To Membrane Properties In Forward Osmosis: Measurements, Modelling And Implications, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech Jan 2014

Relating Rejection Of Trace Organic Contaminants To Membrane Properties In Forward Osmosis: Measurements, Modelling And Implications, Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech

Faculty of Engineering and Information Sciences - Papers: Part A

This study elucidates the relationship between membrane properties and the rejection of trace organic contaminants (TrOCs) in forward osmosis (FO). An asymmetric cellulose triacetate (CTA) and a thin-film composite (TFC) polyamide FO membrane were used for this investigation. The effective average pore radius (rp), selective barrier thickness over porosity parameter (l/ε), surface charge, support layer structural parameter (S), pure water permeability coefficient (A) and salt (NaCl) permeability coefficient (B) of the two membranes were systematically characterised. Results show that measured rejection of TrOCs as a function of permeate water flux can be well described by the pore hindrance transport ...


The Effect Of Ageing On Microstructure And Mechanical Properties Of Powder Ti-5al-5mo-5v-1cr-1fe Alloy, Mansur Ahmed, Dmytro Savvakin, Orest M. Ivasishin, E V. Pereloma Jan 2014

The Effect Of Ageing On Microstructure And Mechanical Properties Of Powder Ti-5al-5mo-5v-1cr-1fe Alloy, Mansur Ahmed, Dmytro Savvakin, Orest M. Ivasishin, E V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

The thermo-mechanically processed powder Ti-5Al-5V-5Mo-1Cr-1Fe alloy was aged at 9.23 K for 1-8 h in order to investigate the effect of ageing time on the microstructure-mechanical properties relationships. The microstructures of the alloy after ageing cosist of the both primary and secondary alpha phases with retained B matrix phase. The shift of B peaks in X-ray pattern with ageing time indicates an increase in lattice parameter distorition due to diffusion into the retained B phase of more B stabilisers with smaller atomic radius compared to the elemental Ti. The tensile test results indicate that the sample aged for 1 ...


Microstructure And Mechanical Properties Of Aa5005/Aa6061 Laminated Composite Processed By Accumulative Roll Bonding, Lihong Su, Cheng Lu, Guanyu Deng, A Kiet Tieu Jan 2014

Microstructure And Mechanical Properties Of Aa5005/Aa6061 Laminated Composite Processed By Accumulative Roll Bonding, Lihong Su, Cheng Lu, Guanyu Deng, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

ULTRAFINE-GRAINED (UFG) materials have been gathering much interest for the last two decades as the materials have extraordinary mechanical properties such as high strength, low temperature superplastisity, and high corrosion resistance. Severe plastic deformation (SPD) is the most widely used method to produce UFG materials. Accumulative roll bonding (ARB) has become one of the most important SPD techniques since it was first introduced by Saito et al.[1] As the same equipment as in conventional rolling is used, ARB is considered to be one of the most promising methods for manufacturing UFG sheet materials.


High Di-Electric Constant Nano-Structure Ceramics Synthesis Using Novel Electric Discharge Assisted Mechanical Milling And Magneto Ball Milling And Its Properties, Azrin A. Chowdhury, Andrzej Calka, David Wexler, Konstantin Konstantinov Jan 2014

High Di-Electric Constant Nano-Structure Ceramics Synthesis Using Novel Electric Discharge Assisted Mechanical Milling And Magneto Ball Milling And Its Properties, Azrin A. Chowdhury, Andrzej Calka, David Wexler, Konstantin Konstantinov

Faculty of Engineering and Information Sciences - Papers: Part A

The conventional method to prepare functional oxides is ceramicpowder- based processing typically via solid-state reaction of microcrystalline starting powders at high temperatures. Disadvantages of this approach include the high temperatures of reaction, limited degree of product chemical homogeneity and difficulties in achieving rapid sintering. Various chemicalbased processing routes have been developed to prepare powders of more homogeneous composition, improved reactivity and sintering ability at low temperatures. Regardless of the route chosen to synthesise complex oxides, almost all of them require lengthy heat treatment schedules that usually exceed 10 h, as well as multi-stage processing steps. We describe two approaches to ...


Effect Of Directional Solidification Rate On The Microstructure And Properties Of Deformation-Processed Cu-7cr-0.1ag In Situ Composites, Keming Liu, Zhengyi Jiang, Jingwei Zhao, Jin Zou, Zhibao Chen, Deping Lu Jan 2014

Effect Of Directional Solidification Rate On The Microstructure And Properties Of Deformation-Processed Cu-7cr-0.1ag In Situ Composites, Keming Liu, Zhengyi Jiang, Jingwei Zhao, Jin Zou, Zhibao Chen, Deping Lu

Faculty of Engineering and Information Sciences - Papers: Part A

The influence of directional solidification rate on the microstructure, mechanical properties and conductivity of deformation-processed Cu-7Cr-0.1Ag in situ composites produced by thermo-mechanical processing was systematically investigated. The microstructure was analyzed by optical microscopy and scanning electronic microscopy. The mechanical properties and conductivity were evaluated by tensile-testing machine and micro-ohmmeter, respectively. The results indicate that the size, shape and distribution of second-phase Cr grains are significantly different in the Cu-7Cr-0.1Ag alloys with different growth rates. At a growth rate of 200 μm s-1, the Cr grains transform into fine Cr fiber-like grains parallel to the pulling direction from the ...


Effects Of Temperature And Strain Rate On Microstructure And Mechanical Properties Of High Chromium Cast Iron/Low Carbon Steel Bimetal Prepared By Hot Diffusion-Compression Bonding, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Dengfu Chen, Jianzhong Xu, Xiaoming Zhang, Dianyao Gong Jan 2014

Effects Of Temperature And Strain Rate On Microstructure And Mechanical Properties Of High Chromium Cast Iron/Low Carbon Steel Bimetal Prepared By Hot Diffusion-Compression Bonding, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Dengfu Chen, Jianzhong Xu, Xiaoming Zhang, Dianyao Gong

Faculty of Engineering and Information Sciences - Papers: Part A

The objective of this study is to develop a hot diffusion-compression bonding process for cladding low carbon steel (LCS) to high chromium cast iron (HCCI) in solid-state. The influence of temperature (950-1150 degrees C) and strain rate (0.001-1 s (1)) on microstructure, hardness and bond strength of the HCCI/LCS bimetal were investigated. The interface microstructure reveals that the unbonded region can only be found for 950 degrees C due to lack of diffusion, while the intergrowth between the constituent metals occurred at and above 1100 degrees C. When bonding temperature increases to 1150 degrees C, a carbide-free zone ...


Dynamic Properties Of Sand-Tyre Chip Mixtures, M S. Mashiri, M. Neaz Sheikh, J S Vinod, Hing Ho Tsang Jan 2013

Dynamic Properties Of Sand-Tyre Chip Mixtures, M S. Mashiri, M. Neaz Sheikh, J S Vinod, Hing Ho Tsang

Faculty of Engineering and Information Sciences - Papers: Part A

The stockpiling of scrap tyres is a significant environmental hazard and has attracted ample research attention to explore viable solutions to recycling and reuse of scrap tyres. The authors have recently proposed a novel seismic isolation method using sand-tyre chips (STCh) mixture for protecting buildings and infrastructure. Although the static properties of STCh mixture have been extensively studied, the investigation on the dynamic properties of the mixture has been limited. The dynamic properties of STCh mixture are important to its application for seismic protection of infrastructure. This paper presents the dynamic properties (shear modulus and damping ratio) of STCh mixture ...


The Effect Of Chemical Composition On Microstructure And Properties Of Intercritically Reheated Coarse-Grained Heat-Affected Zone In X70 Steels, Zhixiong Zhu, Lenka Kuzmikova, Huijun Li, Frank J. Barbaro Jan 2013

The Effect Of Chemical Composition On Microstructure And Properties Of Intercritically Reheated Coarse-Grained Heat-Affected Zone In X70 Steels, Zhixiong Zhu, Lenka Kuzmikova, Huijun Li, Frank J. Barbaro

Faculty of Engineering and Information Sciences - Papers: Part A

The current study investigates the effect of different levels of Ti, N, and Ti/N ratios on microstructure and properties in the intercritically reheated coarse-grained heat-affected zone (ICCGHAZ) of two-pass submerged arc welds in API 5L grade X70 pipe. Gleeble simulation was employed to reproduce the ICCGHAZ of actual welds. Hardness and Charpy V-notch (CVN) tests were performed on the simulated samples. The microstructure of simulated ICCGHAZ was characterized by optical microscopy and scanning electron microscopy (SEM). LePera color etching technique was employed to identify and quantify the martensitic-austenitic (M-A) constituent. Results show that the simulated ICCGHAZ exhibited extremely low ...


Effects Of Tungsten Addition On The Microstructure And Mechanical Properties Of Microalloyed Forging Steels, Jingwei Zhao, Taekyung Lee, Jeong Hun Lee, Zhengyi Jiang, Chong Soo Lee Jan 2013

Effects Of Tungsten Addition On The Microstructure And Mechanical Properties Of Microalloyed Forging Steels, Jingwei Zhao, Taekyung Lee, Jeong Hun Lee, Zhengyi Jiang, Chong Soo Lee

Faculty of Engineering and Information Sciences - Papers: Part A

In the current study, the effects of tungsten (W) addition on the microstructure, hardness, and room/low [223 K and 173 K (-50 C and -100 C)] temperature tensile properties of microalloyed forging steels were systematically investigated. Four kinds of steel specimens were produced by varying the W additions (0, 0.1, 0.5, and 1 wt pct). The microstructure showed that the addition of W does not have any noticeable effect on the amount of precipitates. The precipitates in W-containing steels were all rich in W, and the W concentration in the precipitates increased with the increasing W content ...


The Effect Of Cooling Rates On The Microstructure And Mechanical Properties Of Thermo-Mechanically Processed Ti-Al-Mo-V-Cr-Fe Alloys, Mansur Ahmed, Dmytro G. Savvakin, Orest M. Ivasishin, Elena V. Pereloma Jan 2013

The Effect Of Cooling Rates On The Microstructure And Mechanical Properties Of Thermo-Mechanically Processed Ti-Al-Mo-V-Cr-Fe Alloys, Mansur Ahmed, Dmytro G. Savvakin, Orest M. Ivasishin, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

Two near-β titanium alloys, Ti–5Al–5Mo–5V–1Cr–1Fe and a modified one containing 2 wt% Cr (Ti–5Al–5Mo–5V–2Cr–1Fe) were produced from Ti hydride precursor powders via the cost-effective blended elemental powder metallurgy technique. The effects of two cooling rates (10 K s−1 and 1 K s−1) during thermo-mechanical processing on the microstructure and mechanical properties were investigated using X-ray diffraction and scanning electron microscopy. X-ray line profile analysis revealed that dislocation densities and microstrain in β-Ti phase are higher than in α-Ti phase for all cases. In both alloys, slower cooling results ...