Powder Synthesis and Characterization of Al0.5CoCrFeNi High-Entropy Alloy for Additive Manufacturing Prepared by the Plasma Rotating Electrode Process

Yanchun Li; Yi Sui; Yicheng Feng; Yu Zhang; Yan Li; Meihui Song; Shulin Gong; Yang Xie

doi:10.1021/acsomega.4c00291

Powder Synthesis and Characterization of Al_0.5CoCrFeNi High-Entropy Alloy for Additive Manufacturing Prepared by the Plasma Rotating Electrode Process

ACS Omega. 2024 Apr 11;9(16):18358-18365. doi: 10.1021/acsomega.4c00291. eCollection 2024 Apr 23.

Authors

Yanchun Li¹, Yi Sui², Yicheng Feng², Yu Zhang¹, Yan Li¹, Meihui Song¹, Shulin Gong¹, Yang Xie¹

Affiliations

¹ Institute of Advanced Technology, Heilongjiang Academy of Science, Harbin 150000, China.
² School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China.

Abstract

The Al_0.5CoCrFeNi high-entropy alloy powder was produced by using a plasma rotating electrode process. The morphology, microstructure, and physical properties of the powder were characterized. The powder exhibited a smooth surface and a narrow particle size distribution with a single peak. The relationships between particle size and secondary dendrite arm space as well as cooling rate were evaluated as follows: λ = 0.0105d + 0.062 and v_c = 4.34 × 10^-5d^-2 + 2.62 × 10^-2d^-3/2, respectively. The Al_0.5CoCrFeNi powder mainly consisted of fcc + bcc phases. As the powder particle size decreased, the microstructure of the powder changed from dendritic to columnar or equiaxed, along with a decrease in the fcc content and an increase in the bcc content. The tap density (4.76 g cm^-3), flowability (15.01 s × 50 g^-1), oxygen content (<300 ppm), and sphericity (>94%) of the powder indicated suitability for additive manufacturing.