TITANIUM-ALUMINUM INTERMETALLIC COMPOUND EXCELLENT IN TOUGHNESS AND CREEP CHARACTERISTIC, AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a TiAl intermetallic compound excellent in oxidation resistance as well as in toughness and creep characteristic. ;SOLUTION: This TiAl intermetallic compound has a composition consisting of 27-36wt.% Al and the balance Ti with inevitable impurities and is produced by a reaction synthesis method where a powder green compact is treated at high temp. and high pressure. In this intermetallic compound, microstructure is composed of stratiform lamellar structure formed of α₂ phases (Ti₃Al) and γ-phases (TiAl) and the average size of lamellar grains in the lamellar structure is regulated to 500-3000μm. If necessary, Cl, F, Br and I, or Cr, V and Mn, or further Mo, Ta, Zr and Hf can also be added.;COPYRIGHT: (C)1998,JPO