Effect of Enhanced Gravity on the Microstructure and Mechanical Properties of Al0.9CoCrFeNi High-Entropy Alloy

Anjun Shi; Ruixuan Li; Yong Zhang; Zhe Wang; Zhancheng Guo

doi:10.3390/e22111318

Effect of Enhanced Gravity on the Microstructure and Mechanical Properties of Al_0.9CoCrFeNi High-Entropy Alloy

Entropy (Basel). 2020 Nov 19;22(11):1318. doi: 10.3390/e22111318.

Authors

Anjun Shi¹, Ruixuan Li², Yong Zhang², Zhe Wang¹, Zhancheng Guo¹

Affiliations

¹ State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China.
² State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.

Abstract

The influence of enhanced gravity on the microstructure and mechanical properties of the Al_0.9CoCrFeNi high-entropy alloy, which was solidified under normal gravity (acceleration 1 g) and enhanced gravity (acceleration 140 g, acceleration 210 g, and acceleration 360 g) conditions is reported in this paper. Its solidification under enhanced gravity fields resulted in refinement of the columnar nondendritic grain structure and an increase in the area fraction of the body-centered cubic (BCC) structure phases. The mass transfer strengthened by enhanced gravity promoted element diffusion and enrichment, which caused changes in the composition and microstructure that, in turn, affected the mechanical properties of the alloy. The compressive strength and plasticity of the sample solidified at acceleration 360 g were equal to 2845 MPa and 36.4%, respectively, which are the highest values reported to date for Al_0.9CoCrFeNi alloy.

Keywords: enhanced gravity; high-entropy alloys; mechanical properties; microstructure.