ABSTRACT

To elucidate the complex mechanism of solid-solution strengthening in high-entropy alloys (HEAs), it is necessary to determine the effective atomic radii of the constituent elements that are the sources of lattice strain. In the present study, the effective atomic radii of the constituent elements in CrMnFeCoNi HEA that are the basis of the atomic displacements, are evaluated from lattice parameters experimentally determined via θ–2θ X-ray diffraction measurements. The order of the evaluated atomic radii in the present study is different from that of the atomic radii determined via ab-initio calculations in previous studies. The results of the ab-initio calculations indicate a correlation between the yield stress of and the average atomic displacement in the HEA. However, no definite correlation is confirmed by the experimental results in the present study.

摘要

为了阐明高熵合金（HEA）中固溶强化的复杂机制，有必要确定构成晶格应变源的组成元素的有效原子半径。在本研究中，作为原子位移基础的 CrMnFeCoNi HEA 中的组成元素的有效原子半径是从通过θ –2 θ实验确定的晶格参数评估的X射线衍射测量。本研究中评估的原子半径的顺序与先前研究中通过从头算计算确定的原子半径的顺序不同。从头算计算的结果表明了 HEA 的屈服应力和平均原子位移之间的相关性。然而，本研究中的实验结果并未证实明确的相关性。