With the development of aerospace technology

the performance requirements for key components have been gradually increasing. And single material components are no longer able to meet the performance demands under harsh operating conditions. Therefore

direct near-net shaping of dissimilar metal materials has become a key research direction in aerospace

defense

and military industries. Currently

conventional methods for preparing dissimilar metal materials still face challenges such as processing technique and material property compatibility

interface defect control

and difficulties in achieving integrated shaping. The use of additive manufacturing technology for the fabrication of dissimilar metal components has emerged as an important direction of development in the field of material forming and additive manufacturing. The research status of directed energy deposition

selective laser melting and electron beam melting in the additive manufacturing of dissimilar metals is presented in this paper. An overview and summary are provided with powder deposition processes

compatibility between high energy beam and powder layers

control of fully miscible alloy precipitation phases

joining of immiscible materials using high energy beam

and control of interface composition direction. Additionally

potential solutions to these challenges are proposed. Finally

the future development direction of dissimilar metal additive manufacturing in the aerospace field are prospected.