| 摘要 |
PURPOSE:To enable forming working with ease by covering with a specific sheathing material an alloy with an intermetallic compound TiAl base which is a material difficult to work and then by carrying out hot working. CONSTITUTION:The TiAl-base alloy prepared by adding, to a TiAl intermetallic compound consisting of 74-56wt% Ti and 26-44wt% Al, the third and the fourth elements has excellent characteristics such as light weight, resistance to oxidation, specific strength at high temp., and high-temp. creep strength, but, on the other hand, it is a material difficult to work because of its lack of cold ductility and inferiority in high-temp. deformability. In subjecting this material to forming working, the TiAl-base alloy material is covered with the sheathing material which causes no chemical reaction with TiAl-base alloys of Ni type, Co type, Fe-Ni type, etc., having high-temp. deformation resistance close to the high-temp. deformation resistance of this TiAl-base alloy at 1,000 deg.C and has a capacity to undergo plastic working, cutting work, and welding, which is subjected to hot working. In this way, the forming working into required shape is facilitated.
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