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Strengthening mechanisms in CrMoNbTiW refractory high entropy alloy

机译：CrmonBTIW耐火材料高熵合金的加强机制

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摘要

We have investigated the strengthening mechanisms of as-cast CrMoNbTiW BCC refractory high entropy alloy (RHEA). The cast RHEA was deformed at a constant strain rate of 10~(-3) s~(-1) and a temperature range of 1100-1300 °C. The various factors contributing to the overall strength of the cast alloy are explored with comprehensive experimental evidence. In as-cast RHEA, solid solution strengthening is the dominant mechanism among other factors. A modified Varvenne's solid solution strengthening model is used to predict the yield strength (YS) of the RHEA at high temperatures. The experimentally determined YS exhibits a strong temperature dependence, and the predicted YS values are significantly affected by the temperature-dependent material constants. The absolute value of the predicted YS depends on the shear modulus, whereas the variation of YS with temperature is affected by the Poisson's ratio. Moreover, our study demonstrates that it is feasible to predict the high temperature YS using material constants from literature besides DFT studies.
机译：我们研究了铸造CrmonbtiWBCC耐火高熵合金（RHEA）的强化机制。以恒定应变速率为10〜（-3）S〜（-1）的恒定应变率和1100-1300℃的温度范围变形。探讨了促进铸造合金总体强度的各种因素，具有全面的实验证据。在AS-r rhea中，固体溶液加强是其他因素的主要机制。改进的瓦伦讷省的固体溶液强化模型用于预测高温下锐角的屈服强度（ys）。实验确定的Ys表现出强烈的温度依赖性，并且预测的ys值受温度依赖性材料常数显着影响。预测y的绝对值取决于剪切模量，而具有温度的ys的变化受泊松比的影响。此外，我们的研究表明，除了DFT研究之外，可以使用来自文献的材料常数预测高温ys是可行的。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141503.1-141503.10|共10页
  • 作者

    Lavanya Raman; Ameey Anupam; G. Karthick; Christopher C. Berndt; Andrew Siao Ming Ang; S V S Narayana Murty; Daniel Fabijanic; B S Murty; Ravi Sankar Kottad;

  • 作者单位

    Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai 600036 India;

    Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai 600036 India Surface Engineering for Advanced Materials (SEAM) Swinburne University of Technology Hawthorn Victoria 3122 Australia;

    Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai 600036 India;

    Surface Engineering for Advanced Materials (SEAM) Swinburne University of Technology Hawthorn Victoria 3122 Australia;

    Surface Engineering for Advanced Materials (SEAM) Swinburne University of Technology Hawthorn Victoria 3122 Australia;

    Materials and Metallurgy Group Vikram Sarabhai Space Center Trivandrum 695022 India;

    Institute for Frontier Materials Deakin University Geelong VIC 3220 Australia;

    Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai 600036 India Indian Institute of Technology Hyderabad Kandi 502285 India;

    Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai 600036 India;

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  • 正文语种 eng
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  • 关键词

    Refractory high entropy alloy; Strengthening mechanisms; Solid solution strengthening; Hot compression; Yield strength prediction;

    机译：耐火材料高熵合金;加强机制;固体溶液强化;热压缩;屈服强预测;

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