On microstructure and mechanical properties of linear friction welded dissimilar Ti-6Al-4V and Ti-6·5Al-3·5Mo-1·5Zr-0·3Si joint

• Published in: Science and technology of welding and joining Vol. 17; no. 1; pp. 9 - 12
• Main Authors: Ma, T J, Zhong, B, Li, W-Y, Zhang, Y, Yang, S Q, Yang, C L
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 01.01.2012; SAGE Publications
• Subjects: Linear friction welding; Mechanical property; Microstructure; Titanium alloy; Titanium alloy; Linear friction welding; Microstructure; Mechanical property
• ISSN: 1362-1718; 1743-2936
• DOI: 10.1179/1362171811Y.0000000067

Linear friction welding of dissimilar titanium alloys Ti-6Al-4V (TC4) and Ti-6·5Al-3·5Mo-1·5Zr-0·3Si (TC11) was achieved. Microstructural examination showed that the joint has a clearly identified weld zone and a thermomechanically affected zone on both TC4 and TC11 sides with a clearly identified weld line. In the weld zone of TC4, superfine α grains are dispersed in the β matrix, while in that of TC11, a few recrystallised α grains are observed along the β boundaries. In the thermomechanically affected zone of TC4, both deformed and recrystallised grains exist in the same area, while that of TC11 has a deformed α+β structure. The tensile strength of the joint is comparable to that of the parent TC4 where fracture occurs. The joint microhardness is well related to its microstructure.