{"title":"Temperature dependent small-scale deformation of a refractory high entropy alloy","authors":"Shristy Jha , Siva Shankar Alla , Sanjit Bhowmick , Sundeep Mukherjee","doi":"10.1016/j.matlet.2024.137649","DOIUrl":null,"url":null,"abstract":"<div><div>Temperature-dependent deformation behavior of [110] oriented micropillars of HfTaTiVZr refractory high entropy alloy (RHEA) was studied. Engineering stress–strain curves, strain rate sensitivity measurements, and in-situ observations revealed distinct deformation mechanisms at different temperatures: homogeneous at room temperature (RT), intermittent plasticity at 200 °C, chaotic stress drops at 400 °C, brittle failure at 600 °C, and creep-like behavior at 800 °C. Deformation morphology of the micropillars showed activation of few slip systems at RT and 200 °C, multiple slip systems at 400 °C, catastrophic failure at 600 °C, and minimal slip activity at 800 °C. These findings offer unique insights into the deformation of RHEAs.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"379 ","pages":"Article 137649"},"PeriodicalIF":2.7000,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Letters","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167577X24017890","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Temperature-dependent deformation behavior of [110] oriented micropillars of HfTaTiVZr refractory high entropy alloy (RHEA) was studied. Engineering stress–strain curves, strain rate sensitivity measurements, and in-situ observations revealed distinct deformation mechanisms at different temperatures: homogeneous at room temperature (RT), intermittent plasticity at 200 °C, chaotic stress drops at 400 °C, brittle failure at 600 °C, and creep-like behavior at 800 °C. Deformation morphology of the micropillars showed activation of few slip systems at RT and 200 °C, multiple slip systems at 400 °C, catastrophic failure at 600 °C, and minimal slip activity at 800 °C. These findings offer unique insights into the deformation of RHEAs.
期刊介绍：
Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review.
Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials.
Contributions include, but are not limited to, a variety of topics such as:
• Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors
• Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart
• Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction
• Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots.
• Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing.
• Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic
• Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive
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