Strengthening CoCrFeNi high-entropy alloy by Laves and boride phases

作     者：Xiu-gang Chen Gang Qin Xue-feng Gao Rui-run Chen Qiang Song Hong-zhi Cui Xiu-gang Chen;Gang Qin;Xue-feng Gao;Rui-run Chen;Qiang Song;Hong-zhi Cui

作者机构：School of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266500China School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2022年第19卷第6期

页      面：457-463页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(No.51825401) 

主　　题：high-entropy alloy boride eutectic structure mechanical properties 

摘      要：To strengthen the face-centered-cubic(FCC)type CoCrFeNi high-entropy alloy(HEA)by in-situ reinforced phase,(CoCrFeNi)_(100-x)(NbB_(2))_(x)(x=0,2,4,6,8,at.%)alloys were *** constitution,microstructure,tensile mechanical properties of the alloys were studied,and the mechanisms were *** show that the microstructure of all the reinforced alloys consists of the matrix FCC phase,Laves phase,and(Cr_(3)Fe)B_(x) *** eutectic structure and(Cr_(3)Fe)B_(x) phases are formed in the interdendritic region,and the eutectic structure is composed of Laves and FCC *** x increases from 0 to 8,i.e.,with increase of Nb and B elements,the volume fraction of Laves and(Cr_(3)Fe)B_(x) phases increases gradually from 0 to 5.84%and 8.3%,*** testing results show that the ultimate strength of the alloys increases gradually from 409 MPa to 658 MPa,while the fracture strain decreases from 75%to 1.6%.Fracture analysis shows that the crack originates from the(Cr_(3)Fe)B_(x) *** CoCrFeNi alloys are mainly strengthened by the second phase(Laves phase and boride phase).