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Constitutive modeling of the hot deformation behavior of CoCrFeMnNi high-entropy alloy

机译：COCRFEMENNI高熵合金的热变形行为的本构型建模

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摘要

The unfolding characteristics of high-entropy alloys (HEAs) are challenging traditional materials science field with promise for innovative applications, including aerospace and defence. This makes them strong candidates for future applications in the aerospace and defense industries. This research focuses on the hot compressive behavior of equiatomic CoCrFeMnNi alloy at strain rates of 0.01 s~(-1) and 1 s~(-1) and temperatures ranging between 200 and 800 °C. The experimental results were used to develop plastic flow stress models for a variety of existing constitutive models, namely, the Johnson-Cook, modified Johnson-Cook, Zerilli-Armstrong, modified Zerilli-Armstrong, Zener-Hollomon, Hensel-Spittel, and modified Hensel-Spittel. The models were then compared using the correlation coefficient (R) and average absolute relative error (AARE) to determine their suitability for predicting the deformation behavior of this alloy. The results show that the modified Johnson-Cook, Zener-Hollomon, Hensel-Spittel, and modified Hensel-Spittel models are all found to provide reasonable predictive accuracy for the studied alloy. Microstructural analysis was also conducted to compare the samples' micro-structures before and after deformation to confirm the occurrence of discontinuous dynamic recrystallization when strained at 800 °C. This phenomenon explains the material's stress behavior at a lower strain rate, which affects the modeling results.
机译：高熵合金（HEA）的展开特征是挑战传统材料科学领域，承诺为创新应用，包括航空航天和防御。这使得它们在航空航天和国防行业的未来应用中备忘录。该研究侧重于衡量标准群合金的热压缩行为，以0.01秒的菌株为0.01s〜（-1）和1 s〜（-1），温度范围为200至800℃。实验结果用于为各种现有的本构模型开发塑料流量应力模型，即Johnson-Cook，改装Johnson-Cook，Zerilli-Armstrong，改装Zerilli-Armstrong，Zener-Hollomon，Hensel-Spittel和改装Hensel-Spittel。然后使用相关系数（R）和平均绝对相对误差（AARE）进行比较模型以确定它们适合于预测该合金的变形行为的适用性。结果表明，改进的Johnson-Cook，Zener-Hollomon，Hensel-Spittel和改装的Hensel-Spittel模型都发现，为学习合金提供合理的预测精度。还进行了微观结构分析以比较变形前后的样品的微结构，以确认在800℃下应变时不连续动态再结晶的发生。这种现象以较低的应变速率解释了材料的应力行为，这影响了建模结果。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141940.1-141940.28|共28页
  • 作者

    Christopher Brown; Thomas McCarthy; Kanwal Chadha; Samuel Rodrigues; Clodualdo Aranas Jr.; Gobinda C. Saha;

  • 作者单位

    Alloy Design and Materials Testing Research Laboratory (AD-MTRL) University of New Brunswick Fredericton NB E3B 5A3 Canada Nanocomposites and Mechanics Laboratory (NCM Lab) University of New Brunswick Fredericton NB E3B 5A3 Canada;

    Alloy Design and Materials Testing Research Laboratory (AD-MTRL) University of New Brunswick Fredericton NB E3B 5A3 Canada;

    Planetary and Space Science Centre University of New Brunswick Fredericton NB E3B 5A3 Canada;

    Department of Materials Engineering Federal Institute of Maranhao Sao Luis Maranhao Brazil;

    Alloy Design and Materials Testing Research Laboratory (AD-MTRL) University of New Brunswick Fredericton NB E3B 5A3 Canada;

    Nanocomposites and Mechanics Laboratory (NCM Lab) University of New Brunswick Fredericton NB E3B 5A3 Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High-entropy alloy; Flow stress; Constitutive modeling; Dynamic recrystallization;

    机译：高熵合金;流量应力;本构型建模;动态再结晶;

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