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Prof. Dr. Jason Shian-Ching Jang

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Guest Editor

Department of Mechanical Engineering, Institute of Materials Engineering and Engineering, National Central University, Taoyuan, Taiwan
Interests: lightweight high-entropy alloys; bulk metallic glass (BMG) and composite materials; thermoplastic forming of BMG foam
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Che-Wei Tsai

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Guest Editor

1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
2. High Entropy Materials Center, National Tsing Hua University, Hsinchu, Taiwan
Interests: shape memory alloys; high-entropy alloys; wear and tribology; mechanical properties at room temperature and high temperatures; corrosion science of metals and composites; fatigue behavior of metals

Special Issue Information

Dear Colleagues,

High-entropy alloys (HEAs) is an exciting and vibrant research field in materials science, and recently, the research on HEAs has been widespread across the globe. Numerous studies have shown that the high-entropy strategy has great potential for developing new materials with properties beyond those of conventional materials based on one principal element or component by exploring central regions of complex composition space. The topics of interest in this Special Issue include, but are not limited to, the preparation, properties, and applications of materials, encompassing experimental, theoretical, and computational research on phase diagrams, processing, microstructure characterization, and mechanical, physical, chemical, and functional properties of HEMs.

Prof. Dr. Jason Shian-Ching Jang
Prof. Dr. Che-Wei Tsai
Guest Editors

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Related Special Issue

Published Papers (2 papers)

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Research

11 pages, 5295 KiB

Open AccessArticle

Enhancing the Strength and Ductility Synergy of Lightweight Ti-Rich Medium-Entropy Alloys through Ni Microalloying

by Po-Sung Chen, Jun-Rong Liu, Pei-Hua Tsai, Yu-Chin Liao, Jason Shian-Ching Jang, Hsin-Jay Wu, Shou-Yi Chang, Chih-Yen Chen and I-Yu Tsao

Materials 2024, 17(12), 2900; https://doi.org/10.3390/ma17122900 - 13 Jun 2024

Viewed by 189

Abstract

Medium-entropy alloys (MEAs) have attracted considerable attention in recent decades due to their exceptional material properties and design flexibility. In this study, lightweight and non-equiatomic MEAs with low density (~5 g/cm³), high strength (yield strength: 1200 MPa), and high ductility (plastic deformation: ≧10%) were explored. We fine-tuned a previously developed Ti-rich MEA by microalloying it with small amounts of Ni (reducing the atomic radius and increasing the elastic modulus) through solid solution strengthening to achieve a series of MEAs with enhanced mechanical properties. Among the prepared MEAs, Ti65Ni1 and Ti65Ni3 exhibited optimal properties in terms of the balance between strength and ductility. Furthermore, the Ti65Ni3 MEA was subjected to thermo-mechanical treatment (TMT) followed by cold rolling 70% (CR70) and cold rolling 85% (CR85). Subsequently, the processed samples were rapidly annealed at 743 °C, 770 °C, 817 °C, and 889 °C at a heating rate of 15 °C/s. X-ray diffraction analysis revealed that the MEA could retain its single-body-centered cubic solid solution structure after TMT. Additionally, the tensile testing results revealed that increasing the annealing temperature led to a decrease in yield strength and an increase in ductility. Notably, the Ti65Ni3 MEA sample that was subjected to CR70 and CR85 processing and annealed for 30 s exhibited high yield strength (>1250 MPa) and ductility (>13%). In particular, the Ti65Ni3 MEA subjected to CR85 exhibited a specific yield strength of 264 MPa·cm³/g, specific tensile strength of 300 MPa·cm³/g, and ductility of >13%. Full article

(This article belongs to the Special Issue Future Trends in High-Entropy Alloys (2nd Edition))

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16 pages, 5073 KiB

Open AccessArticle

New-Generation Materials for Hydrogen Storage in Medium-Entropy Alloys

by Dagmara Varcholová, Katarína Kušnírová, Lenka Oroszová, Jens Möllmer, Marcus Lange, Katarína Gáborová, Branislav Buľko, Peter Demeter and Karel Saksl

Materials 2024, 17(12), 2897; https://doi.org/10.3390/ma17122897 - 13 Jun 2024

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Abstract

This study presents the design, preparation, and characterization of thirty new medium-entropy alloys (MEAs) in three systems: Al-Ti-Nb-Zr, Al-Ti-Nb-V, and Al-Ti-Nb-Hf. The hardness of the alloys ranged from 320 to 800 HV_0.3. Among the alloys studied, Al₁₅Ti₄₀Nb₃₀Zr₁₅ exhibited the highest-reversible hydrogen storage capacity (1.03 wt.%), with an H/M value of 0.68, comparable to LaNi₅, but with a reduced density (5.11 g·cm⁻³) and without rare earth elements. This study further reveals a strong correlation between hardness and hydrogen absorption/desorption; higher hardness is responsible for reduced hydrogen uptake. This finding highlights the interplay between a material’s properties and hydrogen storage behavior in MEAs, and has implications for the development of efficient hydrogen storage materials. Full article

(This article belongs to the Special Issue Future Trends in High-Entropy Alloys (2nd Edition))

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