Powder Synthesis and Characterization of Al 0.5 CoCrFeNi High-Entropy Alloy for Additive Manufacturing Prepared by the Plasma Rotating Electrode Process

作者：Yanchun Li, Yi Sui, Yicheng Feng, Yu Zhang, Yan Li, Meihui Song, Shulin Gong, Yang Xie · 发表于：ACS Omega · 年份：2024 · DOI：10.1021/acsomega.4c00291 · 被引用次数：4 · 研究领域：High Entropy Alloys Studies、Additive Manufacturing Materials and Processes、High-Temperature Coating Behaviors

High Resolution Image Download MS PowerPoint Slide The Al 0.5 CoCrFeNi 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 = 0.0105 d + 0.062 and v c = 4.34 × 10 –5 d –2 + 2.62 × 10 –2 d –3/2, respectively. The Al 0.5 CoCrFeNi 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.