Scholarlink

<p>The microstructure and deformation behavior are important factors in determining dynamic response for high-entropy alloy (HEA) under extreme conditions. In this work, an as-cast equiatomic CoCrFeNiMn HEA was investigated through compression test conduct at 750&#xa0;°C, 850 °C, 950 °C and 1050 °C subjected to various strain rates (from 0.01 s<sup>−1</sup> to 10 s<sup>−1</sup>). Microstructural characteristics and deformation behavior of CoCrFeNiMn HEA during hot compression of true strain of 0.5 at 950 °C were studied. The calculated strain rate sensitivity, active volume and activation energy for hot compression were 0.1083, 45.1 b<sup>3</sup> and 264.92 kJ/mol, respectively. The combined effects of dislocations, twins, recovery, deformation, and recrystallization attributes to lower values during high-temperature compression. In addition, the flow stress curves were developed an Arrhenius constitutive model from 750 °C to 1050 °C. The new developed Arrhenius-type model exhibited better fit between the experimental and predicted stress. Through the analysis of microstructure evolution, deformation behavior and the constitutive model under extreme situation provide critical insights for the development of new manufacturing techniques into CoCrFeNiMn HEA.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The influence of strain rates on the microstructural characteristics of CoCrFeNiMn high-entropy alloys during compression at elevated temperature

  • 期刊论文

  • 发表日期：

    2025年3月10日

查看全文
  • Qiang Li,
  • Mingxia Wu,
  • Maorui Yan,
  • Ling Xue,
  • Kai Tang,
  • Changyan Gao,
  • Yi Yang,
  • Jian Liu

摘要

The microstructure and deformation behavior are important factors in determining dynamic response for high-entropy alloy (HEA) under extreme conditions. In this work, an as-cast equiatomic CoCrFeNiMn HEA was investigated through compression test conduct at 750 °C, 850 °C, 950 °C and 1050 °C subjected to various strain rates (from 0.01 s−1 to 10 s−1). Microstructural characteristics and deformation behavior of CoCrFeNiMn HEA during hot compression of true strain of 0.5 at 950 °C were studied. The calculated strain rate sensitivity, active volume and activation energy for hot compression were 0.1083, 45.1 b3 and 264.92 kJ/mol, respectively. The combined effects of dislocations, twins, recovery, deformation, and recrystallization attributes to lower values during high-temperature compression. In addition, the flow stress curves were developed an Arrhenius constitutive model from 750 °C to 1050 °C. The new developed Arrhenius-type model exhibited better fit between the experimental and predicted stress. Through the analysis of microstructure evolution, deformation behavior and the constitutive model under extreme situation provide critical insights for the development of new manufacturing techniques into CoCrFeNiMn HEA.