Deformation Behaviors of an Additive-Manufactured Ni_(32)Co_(30)Cr_(10)Fe_(10)Al_(18)Eutectic High Entropy Alloy at Ambient and Elevated Temperatures  

作　　者：Zishu Chai Kexuan Zhou Qingfeng Wu Zhijun Wang Quan Xu Junjie Li Jincheng Wang 

机构地区：[1]State Key Laboratory of Solidification Processing,School of Materials,Northwestern Polytechnical University,Xi’an,710072,China [2]Shanghai Electro Mechanical Engineering Institute,Shanghai,201600,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第10期1607-1616,共10页金属学报（英文版）

基　　金：financially supported by the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(Grant Nos.2020-TS-06,2021-TS-02).

摘　　要：Eutectic high-entropy alloys(EHEAs)that have superior formability are attractive for direct laser deposition technology.In this study,a regular-shaped bulk Ni_(32)Co_(30)Cr_(10)Fe_(10)Al_(18)EHEA without apparent pores and micro-cracks was successfully fabricated by direct laser deposition.The as-deposited alloy showed a high tensile strength of 1.3 GPa with a ductility of 35%at ambient temperature and a tensile strength of 320 MPa at 760℃.The deformation mechanisms of the as-deposited alloy at ambient and elevated temperatures were investigated by coupling the in-situ tensile test with a scanning electron microscope.It is revealed that the excellent combination of strength and ductility originated from the synergic effects of the FCC and B2 phases in eutectic lamellae.And the generation of cracks along phase boundaries restricted its high-temperature strength above 760℃.

关 键 词：Direct laser deposition Eutectic high-entropy alloys Elevated-temperature properties Deformation behaviors 

分 类 号：TG139[一般工业技术—材料科学与工程]