SUPERPLASTIC BEHAVIOUR OF A FINE GRAINED TiAl BASED ALLOY TREATED
BY MULTI-STEP THERMO-MECHANICAL TREATMENT
BY MULTI-STEP THERMO-MECHANICAL TREATMENT
(1.Powder Metallurgy Research Institute, Central South University of Technology, Changsha 410083, P. R. China；
Department of Materials Science and Engineering ShanghaiJiao Tong University, Shanghai200030, P. R. China)
Department of Materials Science and Engineering ShanghaiJiao Tong University, Shanghai200030, P. R. China)
Abstract: A Ti-33Al-3Cr (mass fraction, %) alloy was multi-step thermo-mechanically treated through hot can forging. Samples of the forged plate were tension tested at strain rates of 10-5 to 10-3s-1 and temperatures between 1 000℃and 1075℃. At 1075℃and a strain rate of 8×10-5s-1, the maximum elongation(517%) was achieved. The strain rate sensitivity coefficientmwas about 0.7 under the conditions of 1 075℃and 6×10-5s-1.
Key words: TiAl forging superplasticity