Superplastic behavior of a beta-forged Ti3Al-Nb alloy

Superplastic behavior of a beta-forged Ti3Al-based alloy was investigated b y compression tests and tensile tests and the microstructural evolution dur ing the deformation process was studied. The results show that the true str ain of the material reached 2.0 without surface cracking at 980 degrees C a nd 2 x 10(-3) s(-1) in a compression test. while the elongation was only ab out 100% at 980 degrees C and 10(-4) s(-1). In the primary stage of superpl astic deformation. the separation of lath-like O grains occurred. Newly For med equiaxed O grains slid and rotated in B2 phases and dislocation movemen ts in B2 phase accommodated the sliding process. (C) 2000 Elsevier Science S.A. All rights reserved.