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arXiv 1304.7800cond-mat.mtrl-sci
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难熔金属高熵合金的Monte Carlo/分子动力学模拟

Hybrid Monte Carlo/molecular dynamics simulation of a refractory metal high entropy alloy

Michael Widom, William Paul Huhn, Soumyadipta Maiti, Walter Steurer

摘要:

含有难熔金属Mo-Nb-Ta-W的高熵合金具有体心立方结构,考虑到所有组成元素对在BCC固溶体中的完全互溶性,这并不令人惊讶。然而,第一原理总能量计算的二进制文件揭示了一组不同的能量最小化结构,这意味着化学有序的低温相的可能性。我们应用混合蒙特卡罗和分子动力学方法来评估温度依赖的化学顺序。在300 K时,在混合(Nb,Ta)位和混合(Mo,W)位之间出现了氯化铯有序。这种秩序在升高的温度下丧失。

英文摘要:

The high entropy alloy containing refractory metals Mo-Nb-Ta-W has a body centered cubic structure, which is not surprising given the complete mutual solubility in BCC solid solutions of all pairs of the constituent elements. However, first principles total energy calculations for the binaries reveal a set of distinct energy minimizing structures implying the likelihood of chemically ordered low temperature phases. We apply a hybrid Monte Carlo and molecular dynamics method to evaluate the temperature-dependent chemical order. At 300K a cesium-chloride ordering emerges between mixed (Nb,Ta) sites and mixed (Mo,W) sites. This order is lost at elevated temperatures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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