Superplasticity of the Intermetallic Compound Ti₃Al

R. M. Imaev, N. K. Gabdullin, and G. A. Salishchev

Institute of Problems of Metal Superplasticity, Russian Academy of Sciences,
ul. Khalturina 39, Ufa, 450001 Bashkortostan, Russia

Received April 8, 1996; in final form, July 15, 1996

Abstract—Effect of grain size on the high-temperature mechanical properties of the intermetallic compound
Ti₃Al was studied. The material was found to reveal an unusually strong dependence of plasticity on this micro-
structural parameter. When the grain size approaches submicron level (d < 1 m or close), Ti₃Al demonstrates
substantially higher superplasticity than that characteristic of any other intermetallic compounds studied up to
date. Such unusual behavior of Ti₃Al is likely to be related to the fact that no annealing twins, which are known
to suppress superplastic flow, are formed in Ti₃Al upon heating.

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