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Interplay Of Quantum Size Effect, Anisotropy And Surface Stress Shapes The Instability Of Thin Metal Films, Mikhail Khenner 2016 Western Kentucky University

Interplay Of Quantum Size Effect, Anisotropy And Surface Stress Shapes The Instability Of Thin Metal Films, Mikhail Khenner

Mikhail Khenner

Morphological instability of a planar surface ([111], [011], or [001]) of an ultra-thin metal film is studied in a parameter space formed by three major effects (the quantum size effect, the surface energy anisotropy and the surface stress) that influence a film dewetting. The analysis is based on the extended Mullins equation, where the effects are cast as functions of the film thickness. The formulation of the quantum size effect (Z. Zhang et al., PRL 80, 5381 (1998)) includes the oscillation of the surface energy with thickness caused by electrons confinement. By systematically comparing the effects, their contributions into the ...


Removal Of Mercury(Ii) From Aqueous Solutions By Adsorption On Poly(1-Amino-5-Chloroanthraquinone) Nanofibrils: Equilibrium, Kinetics, And Mechanism Studies, Shaojun Huang, Chengzhang Ma 2016 Kunming University of Science and Technology

Removal Of Mercury(Ii) From Aqueous Solutions By Adsorption On Poly(1-Amino-5-Chloroanthraquinone) Nanofibrils: Equilibrium, Kinetics, And Mechanism Studies, Shaojun Huang, Chengzhang Ma

Kevin Lee


Poly(1-amino-5-chloroanthraquinone)(PACA)nanofibrilswereappliedasnovelnanoadsorbentsforhighlytoxicmercuryremovalfromaqueoussolutions.Aseriesofbatchadsorptionexperimentswereconductedtostudytheeffectofadsorbentdose,pH,contacttime,andmetalconcentrationonHg(II)uptakebyPACAnanofibrils.KineticdataindicatedthattheadsorptionprocessofPACAnanofibrilsforHg(II)achievedequilibriumwithin2hfollowingapseudo-second-orderrateequation.TheadsorptionmechanismofPACAnanofibrilsforHg(II)wasinvestigatedbyFouriertransform-infrared(FT-IR)spectraandX-rayphotoelectronspectroscopy(XPS)analyses.TheadsorptionisothermofHg(II)fittedwelltheLangmuirmodel,exhibitingsuperbadsorptioncapacityof3.846mmolofmetalpergramofadsorbent.Lastly,wefoundoutthattheas-synthesizedPACAnanofibrilsareeficientinHg(II)removalfromrealwastewater.Furthermore,fiveconsecutiveadsorption-desorptioncyclesdemonstratedthatthePACAnanofibrilsweresuitableforrepeatedusewithoutconsiderablechangesintheadsorptioncapacity.


A Ship-In-A-Bottle Strategy To Synthesize Encapsulated Intermetallic Nanoparticle Catalysts: Exemplified For Furfural Hydrogenation, Raghu V. Maligal-Ganesh, Chaoxian Xiao, Tian Wei Goh, Lin-Lin Wang, Jeffrey Gustafson, Yuchen Pei, Zhiyuan Qi, Duane D. Johnson, Shiran Zhang, Franklin Feng Tao, Wenyu Huang 2016 Iowa State University

A Ship-In-A-Bottle Strategy To Synthesize Encapsulated Intermetallic Nanoparticle Catalysts: Exemplified For Furfural Hydrogenation, Raghu V. Maligal-Ganesh, Chaoxian Xiao, Tian Wei Goh, Lin-Lin Wang, Jeffrey Gustafson, Yuchen Pei, Zhiyuan Qi, Duane D. Johnson, Shiran Zhang, Franklin Feng Tao, Wenyu Huang

Wenyu Huang

Intermetallic compounds are garnering increasing attention as efficient catalysts for improved selectivity in chemical processes. Here, using a ship-in-a-bottle strategy, we synthesize single-phase platinum-based intermetallic nanoparticles (NPs) protected by a mesoporous silica (mSiO2) shell by heterogeneous reduction and nucleation of Sn, Pb, or Zn in mSiO2-encapsulated Pt NPs. For selective hydrogenation of furfural to furfuryl alcohol, a dramatic increase in activity and selectivity is observed when intermetallic NPs catalysts are used in comparison to Pt@mSiO2. Among the intermetallic NPs, PtSn@mSiO2 exhibits the best performance, requiring only one-tenth of the quantity of Pt used ...


Welding Procedure Qualification Of A36 Steel Plates Using The Gtaw And Gmaw Processes, Brecken DeOilers, Neri Lupian, Regan Rumph 2016 California Polytechnic State University, San Luis Obispo

Welding Procedure Qualification Of A36 Steel Plates Using The Gtaw And Gmaw Processes, Brecken Deoilers, Neri Lupian, Regan Rumph

Materials Engineering

The purpose of this project was to qualify welding procedure specifications for the Las Positas College welding program using A36 steel in accordance with American Welding Society (AWS) D1.1, B4.0, and B2.1. Qualification was to be performed using both 1G (flat) and 3G (vertical) positions for Gas Tungsten Arc Welding (GTAW) and Gas Metal Arc Welding (GMAW) processes. Required qualification procedures included two face and two root bend tests coupled with a visual inspection for cracks within the weld region greater than ⅛” long, along with two reduced section tensile tests to ensure the tensile strength exceeded ...


Effect Of Thermal Exposure On Tensile Strength And Microhardness Of Welded And Precipitation Hardened Rx82 Aluminum Alloy Extrusions In The T4 And T6 Conditions, Lucien Miller 2016 California Polytechnic State University, San Luis Obispo

Effect Of Thermal Exposure On Tensile Strength And Microhardness Of Welded And Precipitation Hardened Rx82 Aluminum Alloy Extrusions In The T4 And T6 Conditions, Lucien Miller

Materials Engineering

This investigation is focused on the effect paint-bake cycles have on the tensile strength and microhardness of GMAW welded RX82 aluminum extrusions in T4 and T6 base conditions. To simulate the paint-bake cycle, T4 and T6 RX82 aluminum samples were GMAW welded and heat treated at 350°F, 390°F, and 425°F for durations of 30 minutes, 1.0 hour, and 2.0 hours, with five replicates for each treatment. Microhardness profiles of T4 samples treated at 350°F for 30 minutes and 1.0 hour display weld/HAZ HV values of 86.04 and 82.51 respectively, followed ...


Grain Orientation Effects On The Rotating-Bending Fatigue Properties Of Forged 7050-T7452 Aluminum Alloy, Matt Cristler, Jonas Zhang 2016 California Polytechnic State University, San Luis Obispo

Grain Orientation Effects On The Rotating-Bending Fatigue Properties Of Forged 7050-T7452 Aluminum Alloy, Matt Cristler, Jonas Zhang

Materials Engineering

In order to investigate the effects of grain orientation on the high cycle fatigue properties of 7050-T7452 aerospace grade aluminum, rotating-bending fatigue tests were performed on longitudinal (LG) and short transverse (ST) specimens taken from two sample sets (Method A and Method B) of open die forged 7050 aluminum. The fatigue specimens were machined to a 0.2" gage diameter and 4" length and subsequently hand polished to a mirror finish to minimize potential crack initiation sites. The tests were conducted on a Fatigue Dynamics RBF-300 HT tester in the fully reversed loading condition, with stress levels varying from 20 ...


Investigation Of Outlife Time On The Environmental Durability Of P2-Etched, Adhesively-Bonded Aluminum Alloys Using The Astm Wedge Test, Daniel Gross, Corey Sutton 2016 California Polytechnic State University, San Luis Obispo

Investigation Of Outlife Time On The Environmental Durability Of P2-Etched, Adhesively-Bonded Aluminum Alloys Using The Astm Wedge Test, Daniel Gross, Corey Sutton

Materials Engineering

P2 etchant is an environmentally-friendly aluminum etchant which has the potential to replace the Forest Products Laboratory (FPL) etchant as the industry standard. Environmental durability of adhesively-bonded aluminum surfaces etched using a paste version of the P2 etchant were tested using the Boeing-developed wedge test (ASTM D3762 - 03(2010)). This project specifically aimed to examine the relationship between outlife time (the time between etching and adhering) and the ability of bonded aluminum samples to pass the wedge test. Two aluminum alloys, 2024-T3 and 7075-T6, were wedge tested and the etched surfaces examined with an atomic force microscope (AFM) and a ...


Effect Of Hydrogen Pick-Up And Release Behavior On The Tensile Properties Of Electroplated 4340m High-Strength Steel, Blake Daylor, Joshua Fisher, Alan Michelen Ruiz 2016 California Polytechnic State University, San Luis Obispo

Effect Of Hydrogen Pick-Up And Release Behavior On The Tensile Properties Of Electroplated 4340m High-Strength Steel, Blake Daylor, Joshua Fisher, Alan Michelen Ruiz

Materials Engineering

Hydrogen embrittlement of high-strength steel (4340M) was quantified through tensile testing and fractography (SEM). Three types of samples were obtained: rotating beam fatigue specimens, round (notched) tensile specimens, and flat panel specimens. In addition, three different plating types were analyzed (Ni, Cr, Cd-Ti) with a set of samples that was shot peened and a set that was not. Since some of the samples went through a hydrogen relief bake, another factor in our experiment was the amount of time it took for the samples to reach the baking process after they were electroplated (bake delay). There were three levels of ...


Superalloy Metallurgy A Gleeble Study Of Environmental Fracture In Inconel 601, Alan C. Demmons 2016 Cal Poly SLO

Superalloy Metallurgy A Gleeble Study Of Environmental Fracture In Inconel 601, Alan C. Demmons

Master's Theses and Project Reports

At temperatures above 0.5 Tm and in aggressive atmospheres predicting alloy performance is particularly challenging. Nickel alloys used in regimes where microstructure and properties are altered dynamically present unique requirements. Exposure may alter properties with unexpected early failure. The Gleeble is a valuable tool for investigation and simulation of thermo-mechanical properties of an alloy in various regimes up to the threshold of melting. In this study, four regimes of temperature and strain rate were simulated in an argon atmosphere to both investigate and document normal and abnormal failure modes. Commercial Inconel 601 was tested in selected regimes and in ...


Coercivity Enhancement And Gamma Phase Avoidance Of Alnico Alloys, Li Zhang 2016 University of Nebraska-Lincoln

Coercivity Enhancement And Gamma Phase Avoidance Of Alnico Alloys, Li Zhang

Engineering Mechanics Dissertations & Theses

The promotion of social progress requires greater levels of energy efficiency, quality and productivity. However, these developments usually come at the cost of the environment. Green technologies such as electric vehicles, wind turbine and solar panels are ironically overshadowed by supply limitations and high prices of rare earth elements. Therefore, it is important to find alternative materials to replace those that contain critical elements. Alnico alloys show high magnetization, high Curie temperature (800°C) and good corrosion resistance, making it one of the best candidates to replace neodymium-based magnets used in electric vehicles.

In this thesis, methods controlling shape anisotropy ...


Manipulation Of Surface Plasmon Resonance In Metal And Alloy Thin Films Using Dielectric Media, Benjamin DuBray Hall 2016 Rose-Hulman Institute of Technology

Manipulation Of Surface Plasmon Resonance In Metal And Alloy Thin Films Using Dielectric Media, Benjamin Dubray Hall

Graduate Theses - Physics and Optical Engineering

Surface plasmon polaritons are coherent electron oscillations that propagate along an interface between a Drude metal and a dielectric medium. The excitation of polaritons is highly dependent on the dielectric properties of the metal, the thickness of the metal, and the optical properties of the dielectric material. First, plasmonic activity is assessed for several thicknesses of silver and nickel chromium under He-Ne incidence. Relationships between film thickness and metal dielectric function are explored in both cases. To manipulate the plasmonic activity at the silver surfaces, two methods are explored. Silver oxide was grown on the surface of the silver films ...


Magnetron Sputtering And Corrosion Of Ti-Al-C And Cr-Al-C Coatings For Zr-Alloy Nuclear Fuel Cladding, Devin Alan Roberts 2016 University of Tennessee - Knoxville

Magnetron Sputtering And Corrosion Of Ti-Al-C And Cr-Al-C Coatings For Zr-Alloy Nuclear Fuel Cladding, Devin Alan Roberts

Masters Theses

The disaster at the Fukushima Daiichi Nuclear Power Plant in March 2011 bought renewed focus to the issue of corrosion in nuclear fuel cladding applications. This thesis reports on the background behind these issues, the investigation strategy, and the analysis of experiments focused on mitigating oxidation of Zr-alloy fuel cladding. This thesis seeks to develop magnetron sputtered Ti-Al-C and Cr-Al-C coatings for Zr-alloy substrates and characterize the as-deposited and corroded samples.

Ti-Al-C and Cr-Al-C coatings were deposited onto ZIRLO, Si, and Al2O3 [Aluminum Oxide] substrates under various sputtering conditions. A combinatorial sputtering method was employed to refine ...


Temperature-Dependent Structures And Atomic Mixing Behaviors In High-Entropy Alloys, Louis J. Santodonato 2016 University of Tennessee - Knoxville

Temperature-Dependent Structures And Atomic Mixing Behaviors In High-Entropy Alloys, Louis J. Santodonato

Doctoral Dissertations

The goal of the present dissertation is to advance the fundamental understanding of the atomic mixing behavior in a new class of alloys, known as high-entropy alloys (HEAs), and provide new methods to develop HEAs for practical applications. The HEA design strategy is based upon the influence of configurational entropy of mixing, which serves as a driving force for the formation of disordered solid-solution structures in certain alloys. In particular, alloys containing multiple elements have a tendency to form stable, disordered structures, sometimes with exceptional engineering properties. Despite the tendency toward structural disorder, HEAs usually have some degree of structural ...


Cyclic Behavior Of A Hybrid Light Gauge And Hss Mezzanine Structural System, Michael John Kren 2016 Marquette University

Cyclic Behavior Of A Hybrid Light Gauge And Hss Mezzanine Structural System, Michael John Kren

Master's Theses (2009 -)

Cold-formed steel is emerging as an alternative material in the building industry to hot-rolled steel for smaller buildings and indoor structures also called mezzanines. Cyclic testing of a full-scale mezzanine structures composed of cold-formed structural channel beams connected to hollow structural steel (HSS) columns cap plates using wedge expansion anchors at the base plate to generate rotation restraint, is performed in this research. The characteristics of the structure will be explained by displaying full experimental results of structural testing. Unfortunately, limited experimental data outlining the behavior of these structures is available and design criteria is very limited. Thus, there is ...


Electrochemical Characterization Of Xanthate Chemisorption On Copper And Enargite, Tyler Broden 2016 Montana Tech of the University of Montana

Electrochemical Characterization Of Xanthate Chemisorption On Copper And Enargite, Tyler Broden

Graduate Theses & Non-Theses

The electrochemical reactions of copper and enargite (Cu3AsS4) were studied in the absence and presence of xanthate by cyclic voltammetry (C.V.) using electrodes fashioned from pure copper wire obtained from the Metallurgical and Materials Engineering Department, and an enargite mineral sample obtained from the Orphan Girl mine in Butte, MT. Voltammograms were produced in buffer solutions of pH values ranging from 7-12. Electrochemical reactions were discerned by comparing EH-pH diagrams calculated from thermodynamics using StabCal, a computer program developed by Dr. Huang at Montana Tech. The chemisorption of xanthate on the surface of copper ...


Vacuum Brazing Of Diamond To Tungsten Carbide, Zhiyong Yin 2016 Montana Tech of the University of Montana

Vacuum Brazing Of Diamond To Tungsten Carbide, Zhiyong Yin

Graduate Theses & Non-Theses

Diamond tools are increasingly gaining importance as cutting and drilling materials for a wide variety of industrial applications. Polycrystalline diamond (PCD) is the main ultrahard material commercially used in the oil and gas drilling industry. In this study, a reactive brazing process was developed to join polycrystalline diamond (PCD) to WC-13 wt% Co, to form the cutter for fixed-cutter drill bit applications.

Most nonmetals including polycrystalline diamond are not wet by and cannot easily be joined with conventional brazing alloys due to their chemical stability. The experimental approach was first to analyze the effect of adding an active metal (Ti ...


Chlorination And Selective Vaporization Of Rare Earth Elements, Daniel Gaede 2016 Montana Tech of the University of Montana

Chlorination And Selective Vaporization Of Rare Earth Elements, Daniel Gaede

Graduate Theses & Non-Theses

No abstract provided.


Second Order Phase Transition Temperature Of Single Crystals Of Gd5si1.3ge2.7 And Gd5si1.4ge2.6, Ravi Hadimani, Yevgen Melikhov, Deborah Schlagel, Thomas Lograsso, Kevin Dennis, R. William McCallum, David Jiles 2016 Iowa State University

Second Order Phase Transition Temperature Of Single Crystals Of Gd5si1.3ge2.7 And Gd5si1.4ge2.6, Ravi Hadimani, Yevgen Melikhov, Deborah Schlagel, Thomas Lograsso, Kevin Dennis, R. William Mccallum, David Jiles

Deborah L Schlagel

Gd5(Six Ge 1−x)4 has mixed phases in the composition range 0.32 < x < 0.41, which have not been widely studied. In this paper, we have synthesized and indexed single crystal samples of Gd5Si1.3 Ge 2.7 and Gd5Si1.4 Ge 2.6. We have investigated the first order and second orderphase transition temperatures of these samples using magnetic moment vs. temperature andmagnetic moment vs. magnetic field at different temperatures. We have used a modified Arrott plot technique that was developed and reported by us previously to determine the “hidden” second order phase transition temperature of the orthorhombic II phase.


Effects Of Zn Additions To Highly Magnetoelastic Fega Alloys, Thomas Lograsso, Nicholas Jones, Deborah Schlagel, Gabriela Petculescu, Marilyn Wun-Fogle, James Restorff, Arthur Clark, Kristi Hathaway 2016 Iowa State University

Effects Of Zn Additions To Highly Magnetoelastic Fega Alloys, Thomas Lograsso, Nicholas Jones, Deborah Schlagel, Gabriela Petculescu, Marilyn Wun-Fogle, James Restorff, Arthur Clark, Kristi Hathaway

Deborah L Schlagel

Fe1−xMx (M = Ga, Ge, Si, Al, Mo and x ∼ 0.18) alloys offer an extraordinary combination ofmagnetoelasticity and mechanical properties. They are rare-earth-free, can be processed using conventional deformation techniques, have high magnetic permeability, low hysteresis, and low magnetic saturation fields, making them attractive for device applications such as actuators and energy harvesters. Starting with Fe-Ga as a reference and using a rigid-band-filling argument, Zhang et al. predicted that lowering the Fermi level by reducing the total number of electrons could enhance magnetoelasticity. To provide a direct experimental validation for Zhang's hypothesis, elemental additions with lower-than-Ga valence are ...


Rhombohedral Magnetostriction In Dilute Iron (Co) Alloys, Nicholas Jones, Gabriela Petculescu, Marilyn Wun-Fogle, James Restorff, Arthur Clark, Kristi Hathaway, Deborah Schlagel, Thomas Lograsso 2016 Naval Surface Warfare Center

Rhombohedral Magnetostriction In Dilute Iron (Co) Alloys, Nicholas Jones, Gabriela Petculescu, Marilyn Wun-Fogle, James Restorff, Arthur Clark, Kristi Hathaway, Deborah Schlagel, Thomas Lograsso

Deborah L Schlagel

Iron is a well-utilized material in structural and magnetic applications. This does not mean, however, that it is well understood, especially in the field of magnetostriction. In particular, the rhombohedral magnetostriction of iron, λ111 , is anomalous in two respects: it is negative in sign, in disagreement with the prediction of first principles theory, and its magnitude decreases with increasing temperature much too rapidly to be explained by a power law dependence on magnetization. These behaviors could arise from the location of the Fermi level, which leaves a small region of the majority 3d t2g states unfilled, possibly favoring small internal ...


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