Superplastic behavior of a TiAl alloy was investigated in a temperature range between 800 and 1000degreesC and at a strain rate of 1 x 10(-4) s(-1). The results show that the present alloy possesses very good superplasticity even in its as-cast state. A tensile elongation of 628% was obtained at 850degreesC. The observed superplastic behavior can be explained by the formation of a fine microstructure containing a metastable beta-phase during solidification. (C) 2002 Elsevier Science Ltd. All rights reserved.