High-strength lamellar high-entropy alloys in-situ synthesized by laser additive manufacturing

被引：13
作者：
Ouyang, Di [1 ,2 ,3 ]
Zhang, Pengcheng [2 ,3 ]
Zhang, Cheng [2 ,3 ]
Li, Ning [2 ,3 ]
Chan, K. C. [1 ]
Liu, Lin [2 ,3 ]
机构：
[1] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Hung Hom, Kowloon, Hong Kong 999077, Peoples R China
[2] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
[3] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 867卷
基金：
中国国家自然科学基金;
关键词：
Additive manufacturing; High-entropy alloys; Lamellar microstructure; Mechanical properties; METALLIC-GLASS COMPOSITE; DEPOSITION;
D O I：
10.1016/j.msea.2023.144745
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A high-strength lamellar high-entropy alloy (HEA) of Zr45Ti31.5Nb13.5Al10 with excellent ductility was fabricated by in-situ alloying of blended elemental powders via laser directed energy deposition (DED). Microstructure characterizations suggest that the molten pools with body-centred cubic (BCC) structure and heat affected zones with mixed structure of BCC + ordered BCC (B2) nanoprecipitates, are alternately distributed in the DEDprocessed HEA with a lamellar structure. During the deformation process, the molten pools are dominated by dislocation planar slipping, while in the heat affected zones, frequent cross-slip and dislocations pinning caused by dispersed B2 nanoprecipitates occurred, which endows a significant strain hardening capability and deformation uniformity in the DED-processed HEA. This research provides new options for the design and manufacturing of HEAs with outstanding mechanical properties for structural applications.
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页数：6
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