AlCoCrFeNi_(2.1)共晶高熵合金与304不锈钢扩散焊接头强化新策略  

A novel strengthening strategy for diffusion bonded joint of AlCoCrFeNi_(2.1)eutectic high entropy alloy to 304 stainless steel

作　　者：李鹏[1] 孙浩田 李超 吴宝生 杨江 姜瑀 董红刚[1] Peng LI;Hao-tian SUN;Chao LI;Bao-sheng WU;Jiang YANG;Yu JIANG;Hong-gang DONG(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院,大连116024

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第7期2121-2135,共15页中国有色金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52075074);the Science and Technology Plan of Liaoning Province,China(No.2021-MS-117);the Fundamental Research Funds for the Central Universities,China(DUT21JC16)。

摘　　要：为探索共晶高熵合金潜在的工程应用,研究AlCoCrFeNi_(2.1)共晶高熵合金与304不锈钢扩散焊接头的界面组织和力学性能。扩散区由固溶体区和Fe2Al5金属间化合物区组成。不锈钢与高熵合金、高熵合金中两相之间均存在元素扩散速率差异,近高熵合金侧形成由FCC相和γ-Fe相组成的固溶体区,提高接头的剪切强度。另外,接头剪切强度先增加后减少,在980℃,60 min和30 MPa工艺参数下接头最高剪切强度为355 MPa。扩散区形成的互锁结构和局部固溶体结构协同提高接头的剪切强度。To explore the potential engineering applications of eutectic high entropy alloys(EHEA),the interfacial microstructure and mechanical properties of the diffusion bonded joint between AlCoCrFeNi_(2.1)EHEA and 304 stainless steel were investigated.The diffusion zone was composed of solid solution zone and Fe2Al5 intermetallic compound zone.Due to the difference in the element diffusion rates between the dissimilar base metals and that between the two phases of EHEA,a solid solution region composed of FCC phase andγ-Fe phase is constructed on the EHEA side near the interface,which enhances the shear strength of joint.Besides,the shear strength of joint first increases and then decreases.The maximum shear strength of 355 MPa is obtained at 980°C,60 min,and 30 MPa.The interlocking structure and local solid solution structure are formed in the diffusion zone,thus synergistically enhancing the shear strength of joint.

关 键 词：扩散连接 AlCoCrFeNi_(2.1)共晶高熵合金 强化机理 304不锈钢 剪切强度 

分 类 号：TG407[金属学及工艺—焊接]