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- Microstructure (9)
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- ECAP (2)
- EN AW 6082 aluminium alloy (2)
- Electrochemical technique (2)
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Articles 481 - 510 of 547
Full-Text Articles in Materials Science and Engineering
Influence Of Reinforced Plastomers On Injection Moulds Wear, A Guzanová, J Brezinová
Influence Of Reinforced Plastomers On Injection Moulds Wear, A Guzanová, J Brezinová
Journal of Metals, Materials and Minerals
The contribution deals with wear of injection moulds based on aluminium alloy Alumec 89 in friction couples with plastomers reinforced with different glass fibres content. Friction relations in injection moulding were simulated by adhesion dry wear test with help of Amsler equipment with area contact of friction couple. Wear intensity was evaluated by friction coefficient and relative wear by weight loss. Simultaneously, changes of aluminium alloy surface morphology after wear in particular friction couples were analysed.
Production Of Sponge Rubber For Monolayer Rubber Stamp Using Salt Leaching Method, W Trakanpruk, Y Rodthong
Production Of Sponge Rubber For Monolayer Rubber Stamp Using Salt Leaching Method, W Trakanpruk, Y Rodthong
Journal of Metals, Materials and Minerals
Sponge rubber used for monolayer rubber stamp was produced from nitrile butadiene rubber (NBR). Open cells in sponge rubber were created using salt leaching method. Effect of size and amount of sodium chloride which was used as a water soluble salt on the creation of open cells in the rubber was investigated. Carbon black was used as a filler. A different type of surfactant was added to increase the leaching out of salt from the rubber. Cure characteristics of the compound rubbers: maximum torque, minimum torque, scorch time and cure time as well as hardness of the prepared sponge rubber …
Properties Evaluation Of Sodium Nitrite Treated Chitosan-Cotton Fabric, S Srisuk, K Srikulkit
Properties Evaluation Of Sodium Nitrite Treated Chitosan-Cotton Fabric, S Srisuk, K Srikulkit
Journal of Metals, Materials and Minerals
In this study, chitosan coated-cotton fabric was prepared and then treated with sodium nitrite under mild condition, aiming at the partial removal of surface-chitosan in order to solve the problems of surface dyeing and fabric stiffness. The results showed that sodium nitrite treated chitosan-fabric exhibited an improvement of dyeability (higher dye exhaustion and color strength) when compared to untreated fabric. The improvement in dyeability was due to the availability of chitosan amino groups which had an affinity to anionic dyes including reactive dyes. Other fabric properties were evaluated. The results showed that color fastness properties (crocking fastness and light fastness) …
Preparation Of Ultrafine Silver Powder Using Glycerol As Reducing Agent, E Nisaratanaporn, K Wongsuwan
Preparation Of Ultrafine Silver Powder Using Glycerol As Reducing Agent, E Nisaratanaporn, K Wongsuwan
Journal of Metals, Materials and Minerals
The production of silver nanoparticles and sub-micron particles can be achieved by silver alkoxide from silver sulfate and subsequently reducing with glycerol. To reduce the particle size of silver sulfate precursors, ball milling was employed to reduce particle sizes down to 0.81 microns. However, silver sulfate without grinding provided smaller particle sizes of silver particles as opposed to ground specimens. Stirring silver alkoxide simultaneously was efficient to provide for uniform distribution of silver powder. The silver powder thus produced had brain-like shape consisted of very fine aggregate silver particles. The yield of silver powder was in the range of 95-99 …
Demonstration Of The Ntc Ceramic Application For Temperature Measurement And Control Using The Labview-Based Measurement System, T Panmatarith, K Poatong
Demonstration Of The Ntc Ceramic Application For Temperature Measurement And Control Using The Labview-Based Measurement System, T Panmatarith, K Poatong
Journal of Metals, Materials and Minerals
In the present paper, ZnO+0.01SnO2 ceramics were prepared using a standard ceramic method. We present the NTC ceramic application for temperature measurement and control using the LabVIEW-based measurement system. The measured resistance of the sample at room temperature was about 6.5 kΩ. The electrical resistance versus temperature of the sample was measured. The negative temperature coefficient of resistance of the sample was -1.018 %/°C. This sample showed NTC effect and exhibited NTC resistor, indicating their potential application as temperature sensor with low cost. It can be used as temperature sensor by using the NTC effect . The measured temperature (T) …
Chitin Nanowhisker And Chitosan Nanoparticles In Protein Immobilization For Biosensor Applications, P Na Nakorn
Chitin Nanowhisker And Chitosan Nanoparticles In Protein Immobilization For Biosensor Applications, P Na Nakorn
Journal of Metals, Materials and Minerals
In this study, bovine serum albumin (BSA) was used as a model protein for the optimization of protein immobilization on chitin nanowhisker and chitosan nanoparticles under different conditions. Chitosan nanoparticles showed better results than chitin in this immobilization purpose. The immobilization at 15 minutes, pH 6 and 20-25°C was the optimal condition. Subsequently, glucose oxidase (GOD), enzyme used for glucose determination, was applied in order to investigate the optimum immobilization condition on chitosan nanoparticles. The optimal condition prove to…at pH 7, 30°C and 0.5 mg/ml of initial GOD concentration via immobilization at 15 minutes. Chitin nanowhisker and chitosan nanoparticles in …
Water Soluble Chitosan As An Environment-Friendly Coagulant In Removal Of Rubber Particles From Skim Rubber Latex, R Werathirachot, P Danwanichakul, C Kongkaew, S Loykulnant
Water Soluble Chitosan As An Environment-Friendly Coagulant In Removal Of Rubber Particles From Skim Rubber Latex, R Werathirachot, P Danwanichakul, C Kongkaew, S Loykulnant
Journal of Metals, Materials and Minerals
Water soluble chitosan, dissolved in hot deionized water to obtain 0.8% solution, was used for the coagulation-flocculation of skim natural rubber latex. The efficiency of coagulation-flocculation of skim rubber latex without pH adjustment was much poorer than that of neutral skim rubber latex. When adding chitosan solution to the neutral skim rubber latex with a rubber content of 5.300 %wt/vol until the concentration of chitosan in the dispersion was 0.107%, the phase separation between rubber particles and yellow serum was clearly observed. At this condition, the removal efficiency of skim rubber particles was found to be the best among all …
Fabrication Of Al/Al2o3 Composite By Powder Metallurgy Method From Aluminum And Rice Husk Ash, C Dhadsanadhep, T Luangvaranunt, J Umeda, K Kondoh
Fabrication Of Al/Al2o3 Composite By Powder Metallurgy Method From Aluminum And Rice Husk Ash, C Dhadsanadhep, T Luangvaranunt, J Umeda, K Kondoh
Journal of Metals, Materials and Minerals
Fabrication of Al-4wt.%Cu /Alumina composite was reported. The method of fabrication was powder metallurgy by in-situ reaction to form alumina during fabrication. Starting materials were mixture of aluminum, copper, and silica powders. Silica is in form of rice husk ash. The mixture was cold compacted, and sintered at 650°C for 1 h. Hot forging was carried out to further consolidate the sintered billet, followed by 10-h heat treatment at temperatures between 590 to 650°C. Phase analysis by XRD confirmed that in-situ reaction between silica and aluminum powders occurred during heat treatment at temperatures above 590°C. The products of reaction were …
Diffusion Bonding Of Stainless Astm A240 Grade 304 In Double Side Flux Cored Arc Welding, S Pitaknorachon, B Poopat
Diffusion Bonding Of Stainless Astm A240 Grade 304 In Double Side Flux Cored Arc Welding, S Pitaknorachon, B Poopat
Journal of Metals, Materials and Minerals
Double side flux cored arc welding (DS-FCAW) has been developed from conventional flux cored arc welding (FCAW). DS-FCAW, dual torches are used by placing an opposite to each other and welding on both sides simultaneously. The objective of this research paper is to investigate diffusion bonding effect due to DS-FCAW. Stainless steel ASTM A240 Grade 304 was studied. Other welding parameters were set constant except welding current and voltage. Diffusion bonding was observed even though weld profiles from macro inspection showed lack of penetration by weld metal in all experiments. It can be concluded that, at certain conditions, the welds …
Effects Of Yttria Concentration And Microstructure On Electric Breakdown Of Yttria Stabilized Zirconia, O Jongprateep, V Petrovsky, F Dogan
Effects Of Yttria Concentration And Microstructure On Electric Breakdown Of Yttria Stabilized Zirconia, O Jongprateep, V Petrovsky, F Dogan
Journal of Metals, Materials and Minerals
Ceramic materials have great potentials for capacitor application. However, low breakdown strength of the materials remains a key challenge for development of high performance capacitors. In this study, yttria stabilized zirconia (YSZ) were fabricated and tested for breakdown strength. YSZ samples with 3, 8, and 10 mol% yttria were carefully processed to control grain size and porosity level. Experimental results revealed that breakdown strength as high as 2 MV/cm could be achieved. The breakdown strength was not significantly affected by porosity level, but it was by yttria concentration. Relationship among yttria concentration, residual porosity and breakdown strength is discussed in …
Improved L-929 Cell Growth From Self Assembled Pdadmac/Gelatin Thin Films, P Kittitheeranun, P Potiyaraj, T Bunaprasert, N Sanchavanakit, S T. Dubas
Improved L-929 Cell Growth From Self Assembled Pdadmac/Gelatin Thin Films, P Kittitheeranun, P Potiyaraj, T Bunaprasert, N Sanchavanakit, S T. Dubas
Journal of Metals, Materials and Minerals
This article demonstrates the advantages of using PDADMAC/gelatin over chitosan/gelatin multilayer thin films to improve L-929 mouse fibroblast growth. Although chitosan-based materials are often preferred in cell culture, we put in evidence the problematic low stability and decomposition of chitosan based film under physiological pH. Two kinds of coating were assembled using either chitosan or Poly(diallyldimethylammonium chloride) (PDADMAC) as polycationic polyelectrolyte and gelatin as the anionic counterpart. The non-toxic nature of each coating was confirmed by MTT assay for cell viability and cell proliferation. Using optical microscopy, it was observed that the L-929 fibroblast spread preferentially on the PDADMAC/gelatin surface …
Improvement Of Mechanical Properties For En Aw 6082 Aluminium Alloy Using Equal-Channel Angular Pressing (Ecap) And Post-Ecap Aging, M Fujda, T Kvačkaj, K Nagyová
Improvement Of Mechanical Properties For En Aw 6082 Aluminium Alloy Using Equal-Channel Angular Pressing (Ecap) And Post-Ecap Aging, M Fujda, T Kvačkaj, K Nagyová
Journal of Metals, Materials and Minerals
The mechanical properties and microstructure of EN AW 6082 aluminium alloy subjected to severe plastic deformation and aging treatment were compared with those of the extruded and artificially aged state (initial state). The initial state of alloy subjected to solution annealing and quenching was severely deformed at ambient temperature by equal channel angular pressing (ECAP) following route C up to three passes. Polyedric microstructure of initial state was considerably changed by the repetitive ECA-pressing. Deformation bands with different density of slip lines were observed in microstructure of ECAPed and aged states, which indicated non-uniform deformation across the cross-section of ECAPed …
Effects Of Tin Powder On Properties Of Sintered Stainless Steels, N Tosangthum, P Muangtong, O Coovattanachai, M Morakotjinda, T Yodkaew, P Wila, R Krataitong, B Vetayanugul, R Tongsri
Effects Of Tin Powder On Properties Of Sintered Stainless Steels, N Tosangthum, P Muangtong, O Coovattanachai, M Morakotjinda, T Yodkaew, P Wila, R Krataitong, B Vetayanugul, R Tongsri
Journal of Metals, Materials and Minerals
It was found that addition of 4 wt.% of gas-atomized tin (Sn) powder to stainless steel powders could alter sintered properties of P/M stainless steels. For stainless steel series 300 powders, Sn powder addition resulted in improved tensile properties and hardness. It was speculated that the liquid Sn, formed during sintering process, acted as either a sintering activator or a solvent for nickel (Ni) dissolution. Sintering activation existed because the liquid Sn acted as a diffusion path for powder particle constituent atoms. Dissolution of Ni in Sn was simply due to diffusion of Ni atoms from stainless steel series 300 …
Surface Modification Of Bricks By Chitosan Coatings, S Nilpairach, S T. Dubas
Surface Modification Of Bricks By Chitosan Coatings, S Nilpairach, S T. Dubas
Journal of Metals, Materials and Minerals
Bricks were successfully modified by application of a chitosan coating in order to provide their surface with a water repellant character. The chitosan coating was prepared by depositing solutions of variable chitosan concentration (1% or 2.5% w/w) onto the brick surface and let to dry under ambient condition. In order to improve the water repellant property, the films were cross-linked with a 1% solution of sodium citrate, sodium sulfate or sodium tri - polyphosphate. The effect of the chitosan concentration on the morphology of the coating at the brick surface was observed by scanning electron microscope (SEM). It was found …
Sintered Materials Prepared From Stainless Steel Series 300 And 400 Powders, M Morakotjinda, N Kuljittipipat, N Poolthong, N Tosangthum, P Wila, R Krataitong, T Yodkaew, O Coovattanachai, B Vetayanugul, R Tongsri
Sintered Materials Prepared From Stainless Steel Series 300 And 400 Powders, M Morakotjinda, N Kuljittipipat, N Poolthong, N Tosangthum, P Wila, R Krataitong, T Yodkaew, O Coovattanachai, B Vetayanugul, R Tongsri
Journal of Metals, Materials and Minerals
Some sintered materials were prepared from mixtures of stainless steel series 300 and series 400 powders. The sintered stainless steels consisted of both austenitic and ferritic phases so they were designated as sintered duplex stainless steels (SDSSs). Microstructures and properties of the SDSSs were characterized and tested. Most SDSSs, except the 310L powder-base SDSSs, showed improved tensile strengths and hardness but exhibited inferior ductility, compared to those of the sintered stainless steels series 300. The 304L-410L SDSS showed promising mechanical properties. This SDSS were further investigated by varying weight ratio of 304L and 410L powders. It was found that sintered …
Nano-Size Hydroxyapatite Powders Preparation By Wet-Chemical Precipitation Route, N Monmaturapoj
Nano-Size Hydroxyapatite Powders Preparation By Wet-Chemical Precipitation Route, N Monmaturapoj
Journal of Metals, Materials and Minerals
In this study, wet-chemical process was performed to prepare nano-size hydroxyapatite (HA) powders (≈10 nm) by varying concentration (low, medium and high) of the starting solutions in order to increase the amount of as-dried HA powders with different process conditions. Particle sizes and density were analyzed and differential thermal analysis was used to determine the glass transition (Tg) and the onset crystallization (Tc) temperatures. XRD and SEM were performed to identify phases and microstructure. The wet-chemical precipitation using low concentration of starting solution under reflux environment could be the optimize process to induce the formation of hydroxyapatite rather than tricalcium …
Effect Of Limestone Dust On The Properties Of Thai Pottery Sintering At Low Temperature, S Sangsuk, S Khunthon, S Saenapitak, S Nilpairach
Effect Of Limestone Dust On The Properties Of Thai Pottery Sintering At Low Temperature, S Sangsuk, S Khunthon, S Saenapitak, S Nilpairach
Journal of Metals, Materials and Minerals
Limestone dust from a limestone crushing plant was used as an additive in pottery clay for this experiment. After the limestone dust was sieved through a 35 mesh stainless steel sieve, it was mixed with Angthong pottery clay at various contents. Samples with and without limestone dust were sintered at 600, 700, 900, and 1000o C. Because of limestone blowing for samples with limestone dust sintered at 900 and 1000o C, physical property measurement was performed only for samples sintered at 600 and 700o C. While sintering at low temperatures (600 and 700o C), physical properties of samples with limestone …
Calcium Phosphate Film Coating On Titanium Substrate By Electrochemical Deposition, D P. Kashima, A Rakngarm
Calcium Phosphate Film Coating On Titanium Substrate By Electrochemical Deposition, D P. Kashima, A Rakngarm
Journal of Metals, Materials and Minerals
Calcium phosphate film on titanium substrate was achieved by electrochemical method in four different kinds of electrolyte. The pure titanium metal (99.99%) with 0.8 cm in width and 2 cm in length was used as a substrate and it was subsequently etched by 2M HF for 1 minute before electrochemical deposition. Calcium phosphate film could form at a different current density for each kind of electrolyte as follows: 10 mA/cm2 for MCPM based aqueous solution, 20 mA/cm2 for MCPM based aqueous solution with ions addition, 10 mA/cm2 and 20 mA/cm2 for MCPM based 20%V/V ethanol and 50%V/V ethanol solution, respectively. …
Sintered Properties Of 409l Powder Compacts Influenced By Metal Powder Additives, O Coovattanachai, T Yodkaew, M Morakotjinda, N Tosangthum, R Krataitong, A Daraphan, B Vetayanugul, R Tongsri
Sintered Properties Of 409l Powder Compacts Influenced By Metal Powder Additives, O Coovattanachai, T Yodkaew, M Morakotjinda, N Tosangthum, R Krataitong, A Daraphan, B Vetayanugul, R Tongsri
Journal of Metals, Materials and Minerals
Sintering of powder compacts, prepared by admixing of 409L powder with 2-6 wt.% of copper and nickel powders was investigated. It was observed that the strength of the 409L-Cu specimens increased with increasing Cu content. In contrast, sintered density and elongation decreased with increasing Cu content due to swelling effect. When 2 wt.% of Ni powders were added, sintered density and strengths were maximized. When Ni contents higher than 2 wt.% , the decrease of sintered density and strengths were attributed to the number of pores left by the original sites of Ni powder particles.
Sintered Fe-Al2o3and Fe-Sic Composites, T Yodkaew, M Morakotjinda, N Tosangthum, O Coovattanachai, R Krataitong, P Siriphol, B Vetayanugul, S Chakthin, N Poolthong, R Tongsri
Sintered Fe-Al2o3and Fe-Sic Composites, T Yodkaew, M Morakotjinda, N Tosangthum, O Coovattanachai, R Krataitong, P Siriphol, B Vetayanugul, S Chakthin, N Poolthong, R Tongsri
Journal of Metals, Materials and Minerals
The presence of non-reactive (Al2O3) and reactive (SiC) hard particles affected properties of sintered Fe-base composites. With the same compacting and sintering conditions, addition of Al2O3 particles caused reduction of sintered densities. Tensile strengths, elongation and hardness of the sintered Fe-Al2O3 materials decreased with increasing Al2O3 particle amounts. The presence of Al2O3 particles prohibited compacting and sintering processes of the Fe powder. In contrast, addition of SiC particles resulted in reaction between Fe and SiC particles. Sintered density of the sintered Fe-SiC composites was significantly lower than that of the sintered Fe-Al2O3 materials. However, tensile strengths and hardness, except elongation, …
Current Status Of Nanotechnology Consumer Products And Nano-Safety Issues, N Chuankrerkkul, S Sangsuk
Current Status Of Nanotechnology Consumer Products And Nano-Safety Issues, N Chuankrerkkul, S Sangsuk
Journal of Metals, Materials and Minerals
This paper is divided into 2 parts to present a review on nanotechnology consumer products ('Nanotech' products) and a current status on 'Nano-Safety' issue. The first part focuses on up-to-date information of 'Nanotech' products that were already on the market as reported by Project on Emerging Nanotechnologies of the Woodrow Wilson International Center for Scholars. There are more than 500 products for a variety of applications, among which health and fitness products are the largest category. The products in this group consist of clothing, cosmetics and sunscreens. Silver is the most commonly used material, followed by carbon in the forms …
Morphology Controlled Calcium Ortho Phosphates Induced By Chemical Additions Under Hydrothermal Reaction, D P. Kashima, E Kongkul, T Daopradubwon
Morphology Controlled Calcium Ortho Phosphates Induced By Chemical Additions Under Hydrothermal Reaction, D P. Kashima, E Kongkul, T Daopradubwon
Journal of Metals, Materials and Minerals
Morphology controlled calcium orthophosphates under hydrothermal reaction was achieved using saturated solution of monocalcium phosphate monohydrate (MCPM) as a starting material. MCPM saturated solution was hydrothermally treated at 180°C for 4 and 12 hrs. Citric acid as a chelating agent and a mixed solution of NaNO3 and NaF were individually added into the reactor. The morphologies, phases and microstructures of the obtained products were characterized by optical microscope (OM), X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. Irregular shape crystals were obtained when a saturated solution of MCPM was autoclaved at 180°C for 4 hrs. Though citric acid was …
Prediction Of Tensile Strength For Sandwich Injection Molded Short-Glass-Fiber Reinforced Thermoplastics, S Patcharaphun, G Mennig
Prediction Of Tensile Strength For Sandwich Injection Molded Short-Glass-Fiber Reinforced Thermoplastics, S Patcharaphun, G Mennig
Journal of Metals, Materials and Minerals
This present paper provides a modified rule-of-mixtures relationship which allows for the calculation of ultimate tensile strength (UTS) as a function of the area fraction between skin and core layers. The effects of fiber length and fiber orientation within the skin and core layers on the tensile strength of conventional and sandwich injection molded short-glass-fiber reinforced polypropylene have been studied in detail. The present theory is then applied to existing experimental results and the agreement is found to be satisfactory
Ferroelectric Glass-Ceramic Sintering Aid For Lead Titanate Ceramics, P Sooksaen, I M. Reaney, D C. Sinclair
Ferroelectric Glass-Ceramic Sintering Aid For Lead Titanate Ceramics, P Sooksaen, I M. Reaney, D C. Sinclair
Journal of Metals, Materials and Minerals
Silicate-based glass that devitrifies on heating to form ferroelectric lead titanate has been developed. The potential for use as sintering aid in PbO-based electroceramics has been evaluated by studying the densification of PbTiO3 (PT) with increasing wt% addition of glass powder. As the wt% glass content increased, the density increased, the maximum and room temperature relative permittivity decreased and there was also a decrease in Tc and the c/a ratio. The decrease in Tc is believed to be due to increased clamping from neighbouring grains as the density of the PT increases. The decrease in maximum and room temperature relative …
Surface Modification Of Microfluidic Devices, P Kumlangdudsana, S T. Dubas, L Dubas
Surface Modification Of Microfluidic Devices, P Kumlangdudsana, S T. Dubas, L Dubas
Journal of Metals, Materials and Minerals
Microfluidic is a multidisciplinary which encompasses the fields of physics, chemistry, nanotechnology, engineering, and biotechnology. It has been developed extensively for many applications such as handling biological entities such as DNA separation, immunoassay, cell sorting, biosensors, and enzymatic assays due to the potential offered by miniaturizing, high throughput of analysis, low cost of fabrication, multiplex functionality and portability. The surface modification of microfluidic devices has also been a major focus in research to help to enhance their efficiency. There is a variety of surface modification methods and in this paper we reviews and presents an overview of the surface modification …
The Microgeometry Parameters Of Uncoated And Zinc-Coated Cold Rolled Steel Strips, J Bidulská, T Kvačkaj, V Bodák, R Bidulský
The Microgeometry Parameters Of Uncoated And Zinc-Coated Cold Rolled Steel Strips, J Bidulská, T Kvačkaj, V Bodák, R Bidulský
Journal of Metals, Materials and Minerals
The microgeometry of surface is arithmetically expressed by the arithmetical mean deviation of the profile, Ra and peak count, Pc. Roughening of working rolls was achieved by using the technology EDT (Electric Discharge Texturing) and SBT (Shot Blast Texturing). The paper shows the relationship between the basic microgeometry parameters and the adjustment technology of working rolls. Zinc-coated cold rolled steel strips, uncoated cold rolled steel strips and the Ra, Pc parameters were measured using the tangent profilometer "Hommel Tester T1000". Measurements of Ra and Pc showed the scatter for SBT and EDT rolls, respectively. EDT can provide a considerably greater …
Zn Coatings For Temporary Protection Applied By Peening Technology, J Brezinnová
Zn Coatings For Temporary Protection Applied By Peening Technology, J Brezinnová
Journal of Metals, Materials and Minerals
This paper presents actual investigation results of an experiment that aimed at verifying the possibility of applying zinc on steel surface by peening technology using zinc-coated cut wire. A suitable method for obtained zinc layers and evaluation of their corrosion resistance was determined. Accelerated laboratory tests with presence of SO2 and long term working tests in atmospheric conditions were used. Creation of incoherent zinc coatings was established on the bases of metallographic and spectral analysis. The process of cold zinc by peening may serve as temporary anticorrosion protection of steel surface.
Microstructure And Mechanical Properties Of En Aw 6082 Aluminium Alloy Prepared By Equal-Channel Angular Pressing, M Fujda, T Kvačkaj
Microstructure And Mechanical Properties Of En Aw 6082 Aluminium Alloy Prepared By Equal-Channel Angular Pressing, M Fujda, T Kvačkaj
Journal of Metals, Materials and Minerals
The mechanical properties and microstructure of EN AW 6082 aluminium alloy subjected to severe plastic deformation (SPD) and natural ageing are compared with those of extruded and artificially aged state (initial state) and quenched state of alloy after solution annealing. Quenched state of alloy was deformed at room temperature by equal channel angular pressing (ECAP) following route C up to three passes. Polyedric microstructure of quenched state was considerably changed by SPD. Deformation bands with different amount of deformation were observed in microstructure of ECAPed state, which indicated non-uniform deformation across the cross-section of ECAPed specimen. Ultimate tensile strength (UTS) …
Experimental Methods Of Assessment Of Pvd Coatings Properties, M Hagarová
Experimental Methods Of Assessment Of Pvd Coatings Properties, M Hagarová
Journal of Metals, Materials and Minerals
The paper investigates the properties of thin coatings deposited by Physical Vapour Deposition (PVD) technology. This is a modern technology of depositing thin coatings onto the surface of machine parts. Technological procedures of deposition of thin coatings undergo constant improvement. At the same time, new types of coatings are developed. These developments necessitate evaluation of structure, composition and properties of the coatings. The basic methods of determination of properties of thin coatings include determination of their thickness and hardness, structure and chemical analysis, adhesioncohesion and tribological properties.
Fatigue Performance Of High-Temperature Deep-Rolled Metallic Materials, P Juijerm, I Altenberger
Fatigue Performance Of High-Temperature Deep-Rolled Metallic Materials, P Juijerm, I Altenberger
Journal of Metals, Materials and Minerals
High-temperature deep rolling was developed from conventional deep rolling (deep rolling at room temperature) and performed on various metallic materials, such as austenitic stainless steel AISI 304, normalized plain carbon steel SAE 1045, aluminium alloys (non-precipitation-hardenable AA5083 and precipitation-hardenable AA6110). The fatigue performance of high-temperature deep-rolled specimens was investigated using stress-controlled fatigue tests and compared with the conventionally deep-rolled condition. It was found that high-temperature deep rolling effectively enhances the fatigue performance of steels. However, for aluminium alloys, the beneficial effects of high-temperature deep rolling are not pronounced due to the different strengthening mechanisms in aluminium alloys.