Investigation on TiAl-V-Cr alloy sheet and its superplasticity

doi:10.13251/j.issn.0254-6051.2022.07.037

Abstract

Abstract: TiAl alloys have low density, high modulus, flame retardancy and excellent elevated temperature performances, and have become a new generation of high-temperature structural material. The superplasticity of V and Cr alloyed TiAl alloy sheet was studied, and the microstructure was characterized by EBSD, SEM and TEM. The results show that the microstructure of the sheet is mainly composed of equiaxed γ grains, irregular B2 grains, and little massive α₂ phases, with the average grain size of about 3.5 μm. When tensile deformed at 950 ℃/1×10^-4 s^-1, the alloy sheet exhibits excellent superplasticity, the elongation reaches 345%. By using this characteristic, typical test pieces of complex structure for aviation engine tail nozzle are manufactured successfully.

Key words: TiAl alloy sheet, microstructure, superplasticity

CLC Number:

TG139

Liu Hongwu, Gao Fan, Feng Xiangzheng, Li Zhenxi, Wang Qingfeng. Investigation on TiAl-V-Cr alloy sheet and its superplasticity[J]. Heat Treatment of Metals, 2022, 47(7): 216-220.

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