Joint Characteristics of Dissimilar Materials Friction Welds (II) : In the Case of Titanium/Aluminium Welds(Mechanics, Strength & Structure Design)

概要

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The dominant factors determining the joint characteristics (strength, ductility and so on) in titanium and aluminium friction welds were investigated variously from the mechanical and metallurgical points of view. The mechanical factors were not the main factors determining the characteristics of the joints, as residual stress and plastic strain generated by the friction welding were not so large. It was found that the main factors dominating the characteristics of the joint were the metallurgical, that is the thickness of the intermetallic compound layer produced at the interface. The critical thickness of the intermetallic compound layer was about 5μm. When this kind of the joint is used in a high temperature environment, the working temperature and time should be sufficiently noted. When the working time became long, the characteristics of the joints were largely decreased as the thickness of the intermetallic compound layer increased.
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