Abstract
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. TiAl3 formed in the reaction layer when DC-CMT mode was used, while TiAl3, 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.
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