Figure 7.

Optical micrographs of Ti-6Al-4V alloy after superplastic tensile deformation at the temperatures of 973 and 1123 K; (a) $\dot{\epsilon }$ = 10⁻³ s⁻¹ and (b) $\dot{\epsilon }$ = 5 × 10⁻³ s⁻¹ (973 K); (c) $\dot{\epsilon }$ = 10⁻³ s⁻¹ and (d) $\dot{\epsilon }$ = 5 × 10⁻³ s⁻¹ (1123 K).