Experimental determination of effective atomic radii of constituent elements in CrMnFeCoNi high-entropy alloy

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.

KEYWORDS:

• Crmnfeconi
• high-entropy alloy
• effective atomic radius
• lattice parameter
• atomic displacement

Acknowledgement

This study is based on work supported by the Grant-in-Aid for Scientific Research (ID: 19H05174) through the Japan Society for the Promotion of Science (JSPS).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by JSPS: [Grant Number 19H05174].