Abstract
The dominant factors determining the joint characteristics (strength, ductility etc.) in friction welds between Ti and Al were investigated from both mechanical and metallurgical points of view. The principal factors determining the joint characteristics were not mechanical, as the residual stress and plastic strain generated by the friction welding were not especially high. Instead, it was found that the joint characteristics were dominated mainly by a metallurgical factor, that is, the thickness of the intermetallic compound layer produced at the interface. The critical thickness of the intermetallic compound layer was about 5 νm. When this type of joint is used in a high temperature environment, the working temperature and time should be carefully monitored. For long working times, the joint characteristics were greatly deteriorated as the thickness of the intermetallic compound layer increased.
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