Effects of cold metal transfer mode on the reaction layer of wire and arc additive-manufactured Ti-6Al-4V/Al-6.25Cu dissimilar alloys  

作　　者：Yinbao Tian Junqi Shen Shengsun Hu Jian Gou Yan Cui 

机构地区：[1]Tianjin Key Laboratory of Advanced Joining Technology,Tianjin University,Tianjin 300354,China [2]School of Materials Science and Engineering,Tianjin University,Tianjin 300354,China [3]Department of Mechanical Engineering,University of Michigan,Ann Arbor,MI 48109,USA

出　　处：《Journal of Materials Science & Technology》2021年第15期35-45,共11页材料科学技术（英文版）

基　　金：National Natural Science Foundation of China(grant number 52075377 and 51575381);Tianjin Research Program of Application Foundation and Advanced Technology(grant number 15JCZDJC38600);supported by the China Scholarship Council(No.201706255090 and No.201806250043)。

摘　　要：Components of Ti and Al dissimilar alloys were obtained by wire and arc additive manufacturing using two cold metal transfer(CMT)modes.Direct current CMT(DC-CMT)mode was used for Ti alloy deposition,and DC-CMT or CMT plus pulse(CMT+P)mode was used for the Al alloy deposition.During deposition of the first Al alloy layer,little and a significant amount of Ti alloy were melted using DC-CMT and CMT+P mode,respectively.TiAl_(3)formed in the reaction layer when DC-CMT mode was used,while TiAl_(3),TiAl,and Ti3Al formed in the reaction layer when CMT+P mode was used.Compared to using DC-CMT mode,more cracks occurred when using CMT+P.The nanohardness of the reaction layer was between that of the Al and Ti alloys,irrespective of the CMT modes.The average tensile strengths of the samples using DC-CMT and CMT+P mode were 108 MPa and 24 MPa,respectively.DC-CMT mode was more suitable for the wire and arc additive manufacturing of Ti/Al dissimilar alloys.

关 键 词：Ti/Al dissimilar alloys Wire and arc additive manufacturing Reaction layer Microstructure Mechanical properties 

分 类 号：TG444.74[金属学及工艺—焊接]