Diffusion bonding of AlCoCrFeNi2.1 eutectic high entropy alloy to TiAl alloy

作     者：Peng Li Shuai Wang Yueqing Xia Xiaohu Hao Honggang Dong Peng Li;Shuai Wang;Yueqing Xia;Xiaohu Hao;Honggang Dong

作者机构：School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第42卷第10期

页      面：59-69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：the National Natural Science Foundation of China(Nos.51605075 and 51674060) the China Postdoctoral Science Foundation(No.2018T110217) the Scientific Research Foundation for Doctor,Liaoning Province of China(No.20170520375) the Fundamental Research Funds for the Central Universities(Nos.DUT18RC(4)032 and DUT18LAB01) 

主　　题：High entropy alloy TiAl alloy Diffusion bonding Microstructure evolution Shear strength 

摘      要：High entropy alloys have special microstructure and remarkable *** explore their potential engineering application in high temperature structures,the microstructure evolution of bonding interface,the elemental diffusion behavior and mechanical property of the diffusion bonded joint between AlCoCrFeNi2.1eutectic high entropy alloy(EHEA)and TiAl alloy were *** reaction layers(rodlike B2 phase,Al(Co,Ni)2Ti,τ3-Al3NiTi2+TiAl,τ3-Al3NiTi2+TiAl+Ti3Al)formed in the diffusion zone near FCC phase of EHEA,but three layers(Al(Co,Ni)2Ti,τ3-Al3Ni Ti2+Ti Al,τ3-Al3Ni Ti2+Ti Al+Ti3Al)formed near B2 *** and Ni controlled the reaction diffusion of EHEA and TiAl alloy,coarsened the acicular precipitated B2 phase and turned Ti Al phase into Al(Co,Ni)2Ti andτ3-Al3NiTi2 *** these reaction layers grew in a parabolic manner as a function of bonding *** B2 phase has the lowest growth activation energy of 125.2 kJ/mol,and the growth activation energy ofτ3-Al3Ni Ti2+TiAl layer near B2 phase is much lower than that near FCC *** penetration phenomenon and convex structure formed in the diffusion zone,which resulted in interlocking effect and enhanced the strength of resultant *** highest shear strength of 449 MPa was achieved at 950℃.And the brittle fracture generally initiated at the interface between Al(Co,Ni)2Ti andτ3-Al3NiTi2+TiAl layers.