Temperature dependent small-scale deformation of a refractory high entropy alloy

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2024-11-02 DOI:10.1016/j.matlet.2024.137649

Shristy Jha , Siva Shankar Alla , Sanjit Bhowmick , Sundeep Mukherjee

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.

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难熔高熵合金随温度变化的小尺度变形

研究了 HfTaTiVZr 难熔高熵合金（RHEA）[110] 取向微柱随温度变化的变形行为。工程应力-应变曲线、应变速率灵敏度测量和原位观测揭示了不同温度下的不同变形机制：室温（RT）下的均匀变形、200 °C时的间歇塑性、400 °C时的混乱应力下降、600 °C时的脆性破坏和800 °C时的蠕变行为。微柱的变形形态显示，在室温和 200 ℃ 时，只有少数滑移系统被激活；在 400 ℃ 时，有多个滑移系统被激活；在 600 ℃ 时，发生灾难性破坏；在 800 ℃ 时，滑移活动极少。这些发现为研究 RHEA 的变形提供了独特的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

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