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γ-TiAl base alloys have potential usage in aerospace engine for their high specific strength.In order to improve their poor hot workability,a new approach of hot deformation processing was investigated.The starting microstructure of Ti-46.5A1-2.5V-1.0Cr(atom percent,%) alloy is fully lamellar(FL) microstructure.The near gamma(NG) microstructure can be obtained through Nickel microalloying and heat treatment at 1-150 ℃.The isothermal compression tests were conducted on both materials using MTS machine at temperatures of 950 C,1 000 C,and 1 050 ℃,and the strain rates of 0.01,0.1 and 1 s ~(-1).Compared with the γ-TiAl alloy with FL microstructure,the Ni-bearing alloy with NG microstructure has better hot workability,such as enlarged hot workable region,decreased flow stresses,more uniform and finer deformed microstructure.
γ-TiAl base alloys have potential usage in aerospace engine for their high specific strength. In order to improve their poor hot workability, a new approach of hot deformation processing was investigated. The starting microstructure of Ti-46.5A1-2.5V-1.0Cr (atom percent,%) alloy is fully lamellar (FL) microstructure. The near gamma (NG) microstructure can be obtained through a Nickel microalloying and heat treatment at 1-150 ° C. The isothermal compression tests were conducted on both materials using MTS machine at temperatures of 950 C, 1000 C, and 1 050 ° C., and the strain rates of 0.01, 0.1 and 1 s -1. Compared with the γ-TiAl alloy with FL microstructure, the Ni-bearing alloy with NG microstructure has better hot workability, such as as enlarged hot workable region, decreased flow stresses, more uniform and finer deformed microstructure.