Key technology for wires and powders assisted plasma arc additive manufacturing of gamm a-TiAl alloys

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This research reveals the homogenization mechanism of Al element and crack　suppressing mechanism in wire arc additive manufacturing of Gama-TiAl alloy, which provides solid theoretical support for additive manufacturing of Gama-TiAl alloy. During the research period, Post doctor researcher wins the IIW 2023 Henry Granjon Award from the International Institute of Welding.The multi-physical simulation and experimental observation showed that the Ti/Al elements can be transferred to the molten pool through a liquid TiAl bridge. The wetting ability of the liquid TiAl metal on the Ti wire surface can be used to predict the possibility of the liquid TiAl bridge breakup. The surface tension causes backward flow and growth of a liquid TiAl droplet and thus suppresses the droplet transfer.