Room and Elevated Temperature Sliding Friction and Wear Behavior of Al0.3CoFeCrNi and Al0.3CuFeCrNi2 High Entropy Alloys (open access)

Room and Elevated Temperature Sliding Friction and Wear Behavior of Al0.3CoFeCrNi and Al0.3CuFeCrNi2 High Entropy Alloys

Article discusses how, in this study, processing–structure–property relations were systematically investigated at room and elevated temperatures for two FCC Al0.3CoFeCrNi and Al0.3CuFeCrNi2 high-entropy alloys (HEAs), also known as complex concentrated alloys (CCAs), prepared by conventional arc-melting. It was determined that both alloys exhibit FCC single-phase solid solution structure. Micro-indentation and sliding wear tests were performed to study the hardness and tribological behavior and mechanisms at room and elevated temperatures.
Date: April 2, 2023
Creator: Kadhim, Dheyaa F.; Korcherla, Manindra V. & Scharf, Thomas W.
Object Type: Article
System: The UNT Digital Library
Tuning the temperature range of superelastic Ni-Ti alloys for elastocaloric cooling via thermal processing (open access)

Tuning the temperature range of superelastic Ni-Ti alloys for elastocaloric cooling via thermal processing

Article describes how caloric cooling enlisting solid-state refrigerants is potentially a promising eco-friendly alternative to conventional cooling based on vapor compression. Here, the authors have explored tuning the operation temperature range of Ni50.8Ti49.2 for elastocaloric cooling. In particular, they have studied the effect of thermal treatments (a.k.a. aging) on the transformation temperature, superelasticity, and elastocaloric effects of Ni50.8Ti49.2 shape memory alloy tubes.
Date: April 28, 2023
Creator: Yamazaki, Takahiro; Montagnoli, Andre L.; Young, Marcus L. & Takeuchi, Ichiro
Object Type: Article
System: The UNT Digital Library
Mapping hierarchical and heterogeneous micromechanics of a transformative high entropy alloy by nanoindentation and machine learning augmented clustering (open access)

Mapping hierarchical and heterogeneous micromechanics of a transformative high entropy alloy by nanoindentation and machine learning augmented clustering

Article describes how conventional macromechanical tests provide limited insights into complex hierarchical deformation behavior of a transformative high entropy alloy (HEA). In this work, a high throughput microstructure-micromechanical correlative study is presented by combining high-resolution nanoindentation, site-specific microscopy, and Gaussian mixture model (GMM) clustering.
Date: April 26, 2023
Creator: Dhal, Abhijeet; Haridas, Ravi Sankar; Agrawal, Priyanka; Gupta, Sanya & Mishra, R. S.
Object Type: Article
System: The UNT Digital Library
Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function (open access)

Surface degradation mechanisms in a eutectic high entropy alloy at microstructural length-scales and correlation with phase-specific work function

Article evaluating wear and corrosion behavior for the AlCoCrFeNi2.1 eutectic high entropy alloy consisting of BCC (B2), and FCC (L12) lamellae.
Date: January 9, 2019
Creator: Hasannaeimi, Vahid; Ayyagari, Aditya; Muskeri, Saideep; Salloom, Riyadh & Mukherjee, Sundeep
Object Type: Article
System: The UNT Digital Library
Physical and optical properties of the International Simple Glass (open access)

Physical and optical properties of the International Simple Glass

This article presents physical property data (both published and previously unpublished) on a single batch of International Simple Glass (ISG), which was cast into individual ingots that were distributed to the collaborators. Properties from the atomic scale to the macroscale, including composition and elemental impurities, phase purity, density, thermal properties, mechanical properties, optical and vibrational properties, and the results of molecular dynamics simulations are presented, as well as information on the surface composition and morphology after polishing. Although the existing literature on the alteration of ISG is not extensively reviewed here, the results of well-controlled static alteration experiments are presented here as a point of reference for other performance investigations.
Date: May 8, 2018
Creator: Kaspar, Tiffany C.; Ryan, Joseph V.; Pantano, Carlo G.; Rice, Jarrett; Trivelpiece, Cory; Hyatt, Neil C. et al.
Object Type: Article
System: The UNT Digital Library
Ultra-High Temperature Stable Morphing Materials for Hypersonic Applications (open access)

Ultra-High Temperature Stable Morphing Materials for Hypersonic Applications

Data management plan for the grant, "Ultra-High Temperature Stable Morphing Materials for Hypersonic Applications"
Date: 2022-04-12/2025-02-28
Creator: Aouadi, Samir
Object Type: Text
System: The UNT Digital Library
Growth Mechanisms of Nano-to Micro-Sized Lead Sulfate Particles (open access)

Growth Mechanisms of Nano-to Micro-Sized Lead Sulfate Particles

This article aims to determine the nucleation and growth mechanisms of PbSO4 nanoparticles in various solutions to potentially reduce or control the buildup of PbSO4 on battery electrodes over time.
Date: April 14, 2021
Creator: Wall, Michael T.; Smith, Jesse D.; Carl, Matthew; Young, Marcus L.; Hesterberg, Travis & Ellis, Tim
Object Type: Article
System: The UNT Digital Library
Engineering the Uniform Lying Helical Structure in Chiral Nematic Liquid Crystals: From Morphology Transition to Dimension Control (open access)

Engineering the Uniform Lying Helical Structure in Chiral Nematic Liquid Crystals: From Morphology Transition to Dimension Control

This article varies the surface anchoring strength and achieves a uniform lying helical structure with long-range order as thermodynamically stable state without any external support in Chiral nematic liquid crystals (CLCs).
Date: April 12, 2021
Creator: Jia, Zhixuan; Pawale, Tejal; Guerrero-García, Guillermo I.; Hashemi, Sid; Martínez-González, José A. & Li, Xiao
Object Type: Article
System: The UNT Digital Library
Ion-exchange mechanisms and interfacial reaction kinetics during aqueous corrosion of sodium silicate glasses (open access)

Ion-exchange mechanisms and interfacial reaction kinetics during aqueous corrosion of sodium silicate glasses

Article on the ion-exchange and associated interfacial reaction mechanisms of silicate glasses. This work reports findings that shed light on the complex ion-exchange mechanisms during glass hydration and enables more detailed understanding of the corrosion and glass-water interactions of silicate glasses which has the potential to impact both science and technology.
Date: April 8, 2021
Creator: Deng, Lu; Miyatani, Katsuaki; Suehara, Michinori; Amma, Shin-ichi; Ono, Madoka; Urata, Shingo et al.
Object Type: Article
System: The UNT Digital Library
Macroscale Superlubricity Accomplished by Sb2O3-MSH/C Under High Temperature (open access)

Macroscale Superlubricity Accomplished by Sb2O3-MSH/C Under High Temperature

Article reporting the high-temperature superlubricity phenomenon accomplished in coatings produced by burnishing powders of antimony trioxide (Sb₂O₃) and magnesium silicate hydroxide coated with carbon (MSH/C) onto the nickel superalloy substrate.
Date: April 15, 2021
Creator: Gao, Kai
Object Type: Article
System: The UNT Digital Library
Charge Transport in Two-Dimensional Materials Based Integrated Flexible Energy System (open access)

Charge Transport in Two-Dimensional Materials Based Integrated Flexible Energy System

Data management plan for the grant "Charge Transport in Two-Dimensional Materials Based Integrated Flexible Energy System."
Date: 2021-04-15/2022-03-14
Creator: Choi, Wonbong
Object Type: Text
System: The UNT Digital Library
Composition-dependent apparent activation-energy and sluggish grain-growth in high entropy alloys (open access)

Composition-dependent apparent activation-energy and sluggish grain-growth in high entropy alloys

Article discusses experimental results which reveal that the apparent activation-energy for grain-growth in an fcc-based AlxCoCrFeNi high entropy alloy (HEA) system increases from 179 to 486 kJ/mol when the Al content increases from x = 0.1 to 0.3.
Date: April 10, 2019
Creator: Gwalani, Bharat; Salloom, Riyadh; Alam, Talukder; Valentin, S.G.; Zhou, X.; Thompson, G. et al.
Object Type: Article
System: The UNT Digital Library
Nanoindentation behavior of high entropy alloys with transformation-induced plasticity (open access)

Nanoindentation behavior of high entropy alloys with transformation-induced plasticity

Article describes an experiment where nanoindentation of three metastable dual-phase high entropy alloys (HEAs) was performed to obtain their inherent elastoplastic deformation responses.
Date: April 29, 2019
Creator: Sinha, S.; Mirshams, Reza; Wang, Tianhao; Nene, S. S.; Frank, M.; Liu, K et al.
Object Type: Article
System: The UNT Digital Library
Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry (open access)

Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

The article reports on the shear deformation of a eutectic structured HEA and effect of precipitation on shear deformation, particularly Al₀.₇CoCrFeNi high-entropy alloy (HEA). A split-Hopkinson pressure bar (SHPB) was used to compress the hat-shaped specimens to study the local dynamic shear response of the alloy. The change in the width of shear bands with respect to precipitation and deformation rates was studied. The precipitation of L1₂ phase did not delay the formation of adiabatic shear bands (ASB) or affect the ASB width significantly, however, the deformed region around ASB, consisting of high density of twins in fcc phase, was reduced from 80 µm to 20 µm in the stronger precipitation strengthened condition.
Date: April 10, 2020
Creator: Gwalani, Bharat; Wang, Tianhao; Jagetia, Abhinav; Gangireddy, Sindhura; Muskeri, Saideep; Mukherjee, Sundeep et al.
Object Type: Article
System: The UNT Digital Library
Influence of ordered L1₂ precipitation on strain-rate dependent mechanical behavior in a eutectic high entropy alloy (open access)

Influence of ordered L1₂ precipitation on strain-rate dependent mechanical behavior in a eutectic high entropy alloy

This article focuses on Al0.7CoCrFeNi, a lamellar dual-phase (fcc + B2) precipitation-strengthenable eutectic high entropy alloy. The back-stresses from the coherent L12 precipitate were insufficient to cause improvement in twin nucleation, owing to elevated twinning stress under quasi-static testing. However, under dynamic testing high density of twins were observed.
Date: April 23, 2019
Creator: Gwalani, Bharat; Gangireddy, Sindhura; Zheng, Yufeng; Soni, V.; Mishra, Rajiv & Banerjee, Rajarshi
Object Type: Article
System: The UNT Digital Library
Synthesis and Ionic Conductivity of Siloxane Based Polymer Electrolytes With Pendant Propyl Acetoacetate Groups (open access)

Synthesis and Ionic Conductivity of Siloxane Based Polymer Electrolytes With Pendant Propyl Acetoacetate Groups

This paper discusses decision to develop solid polyelectrolyte membrances on the basis of new siloxane matrices.
Date: April 13, 2018
Creator: Mukbaniani, Omai; Brostow, Witold, 1934-; Aneli, Jimsher; Tatrishvili, Tamara; Markarashvili, Eliza; Chigvinadze, Maia et al.
Object Type: Paper
System: The UNT Digital Library
Effect of Length, Diameter, Chirality, Deformation, and Strain on Contact Thermal Conductance Between Single-Wall Carbon Nanotubes (open access)

Effect of Length, Diameter, Chirality, Deformation, and Strain on Contact Thermal Conductance Between Single-Wall Carbon Nanotubes

This article explores the role of various geometrical and structural (length, diameter, chirality) as well as external (deformation and strain) carbon nanotube (CNT) parameters to estimate total as well as area-normalized thermal conductance across cross-contact interconnects.
Date: April 16, 2018
Creator: Varshney, Vikas; Lee, Jonghoon; Brown, Joshua S.; Farmer, Barry L.; Voevodin, Andrey A. & Roy, Ajit
Object Type: Article
System: The UNT Digital Library
Effect of Substrate Support on Dynamic Graphene/Metal Electrical Contacts (open access)

Effect of Substrate Support on Dynamic Graphene/Metal Electrical Contacts

This article investigates the stability of dynamic electrical contacts at a graphene/metal interface using atomic force microscopy (AFM), under static conditions with variable normal loads and under sliding conditions with variable speeds.
Date: March 22, 2018
Creator: Lee, Jihyung; Hu, Xiaoli; Voevodin, Andrey A.; Martini, Ashlie & Berman, Diana
Object Type: Article
System: The UNT Digital Library
Analyzing the Effectiveness of Microlubrication Using a Vegetable Oil-Based Metal Working Fluid during End Milling AISI 1018 Steel (open access)

Analyzing the Effectiveness of Microlubrication Using a Vegetable Oil-Based Metal Working Fluid during End Milling AISI 1018 Steel

This article describes a study in which a vegetable oil-based lubricant was used to conduct wear analysis and to analyze the effectiveness of microlubrication during end milling AISI 1018 steel.
Date: April 15, 2014
Creator: Shaikh, Vasim; Boubekri, Nourredine & Scharf, Thomas W.
Object Type: Article
System: The UNT Digital Library
Slurry Erosion of Thermal Spray Coatings: Effect of Sand Concentration (open access)

Slurry Erosion of Thermal Spray Coatings: Effect of Sand Concentration

This paper from the Malaysian International Tribology Conference 2013 conference proceedings discusses using Ni based thermal spray coatings deposited on a commonly used hydroturbine steel.
Date: April 12, 2014
Creator: Singh Grewal, Harpeet; Singh Arora, Harpreet; Agrawal, Anupam; Singh, Harpreet & Mukherjee, Sundeep
Object Type: Paper
System: The UNT Digital Library