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Hierarchical multiphase microstructure in additively manufactured (CoCrNi)83Al17 multi-principal element alloy with high strength
Mengyao Zhenga, Chuanwei Lib,*, Yu Liaob, Zhong Longa,*, Jianfeng Gub,c
aInstitute of Materials, China Academy of Engineering Physics, Mianyang, 621908, China
bInstinute of Materials Modification and Modelling, School of Materials Sctence and Eingineering, Shanghai Jiao Tong University, Shanghai 200240, China
cShanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:
The design of hierarchical microstructure is considered as an effective approach to enhance the mechanical properties of alloys. This study has reported a novel hierarchical multiphase microstructure in an additively manufactured (CoCrNi)83Al17 multi-principal element alloy. The basic cellular unit of this novel structure is composed of a network face-centered cubic phase wrapped around an equiaxed ordered body-centered cubic (B2) phase. Three nano-phases with different compositions, sizes, and orientation relationships with the matrix are further precipitated in the equiaxed B2 phase. This novel hierarchical multiphase microstructure significantly enhances the strength of the alloy and effectively hinders the propagation of microcracks, resulting in a good combination of strength and ductility in the as-built (CoCrNi)83Al17 alloy.
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