Bimodal microstructure design of CrMnFeCoNi high-entropy alloy using powder metallurgy

被引：3

作者：

Fujita K. ^{[1
]}

Fujiwara H. ^{[2
]}

Kikuchi S. ^{[3
]}

机构：

[1] Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, Johoku, Naka-ku, Hamamatsu

[2] Department of Mechanical Engineering, Faculty of Science and Engineering, Shizuoka Institute of Science and Technology, Toyosawa, Fukuroi

[3] Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University, Johoku, Naka-ku, Hamamatsu

来源：

Zairyo/Journal of the Society of Materials Science, Japan | 2021年 / 70卷 / 08期

基金：

日本学术振兴会;

关键词：

Bimodal microstructure; High-entropy alloy; Mechanical milling; Powder metallurgy; Spark plasma sintering;

D O I：

10.2472/jsms.70.648

中图分类号：

学科分类号：

摘要：

Single-phase equiatomic high-entropy alloy (HEA); CrMnFeCoNi, exhibits high strength and ductility at room temperature and low temperature due to the effect of twinning. In this study, a concept of a bimodal microstructure design for HEA using powder metallurgy was proposed. Microstructures of the sintered compact fabricated from HEA powder mechanically-milled using SUJ2 balls were analyzed by EBSD. A network structure of fine grains (Shell), which surrounded the coarse-grained structure (Core), was formed in the HEA compact. The hardness of the HEA with bimodal microstructure were higher than the compact fabricated from as-received HEA powder, and the network structure showed high hardness than Core phase. Furthermore, W-rich surface layer was formed on the HEA powder mechanically-milled using WC-Co balls owing to the transfer of WC-Co balls to the surface of HEA powder during mechanical milling. A network structure of the W-rich phase, which surrounded the HEA phase, was formed in the compact fabricated from the mechanically-milled HEA powder. In particular, the hardness of compact fabricated from HEA powder mechanically-milled using WC-Co balls was high due to the high concentration of tungsten and formation of Shell phase. These results indicate that developed method can control the microstructure of HEA; grain size and elementary diffusion distributions. © 2021 Society of Materials Science Japan. All rights reserved.

引用

页码：648 / 655

页数：7

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