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
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（15）
• 页码范围: 35-45
• 页数: 11页
• 语种: 英文

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.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 us ingDC-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.