Research Progress in High-performance Mg Alloys Prepared by Additive Manufacturing

Mg alloys have broad application prospects in aerospace, rail transit, new energy, biomedical and other fields. The development of additive manufacturing（AM） technologies has made it possible to form high-performance Mg alloys with complex structures. However, the characteristics of low melting and boiling points, high vapor pressure as well as strong oxidation activity of Mg alloys usually lead to the formation of pores, cracks, inclusions and other defects in the AM-prepared components, which results in the application level of AM-prepared Mg alloys far behind the superalloys, Al alloys, Ti alloys and other materials. Therefore,exploring more suitable AM technologies for Mg alloys and reducing their defects via material modification and process optimization are key solutions to break through the application bottlenecks of AM-prepared Mg alloys. The main AM technologies for Mg alloys include selective laser melting（SLM）, wire arc additive manufacturing（WAAM）, friction stir additive manufacturing（FSAM） and ad