Abstract:In the present work, the superplastic characteristics of some γ-TiAl alloys were analysed on the bases of experimental data reported in previous work, and their suitability for diffusion bonding was examined. The constitutive equation ∊ = A DGb/ kT ( b/ d)p ( σ− σ 0/ G)n can be used to describe superplasticity in γ-TiAl alloys, and the equation predicts n=2, p=2, and activity energy Q=220 kJ mol−1. It is suggested that the diffusion bonding model for γ-TiAl alloys should be considered two stages, i.e. a plasti… Show more
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