采用压缩的方法对Ti75合金超塑变形时力学行为和组织演变进行了研究。结果表明,在800℃,5×10-4s-1以及850℃,1×10-1s-1的条件下,m值大于0.3,而900℃时,m值降低;在超塑变形初期由于动态再结晶和β相的扩散,实现板条组织的等轴化、细晶化、均匀化,使α晶粒得以进行滑动和转动,晶界运动成为主要变形机制;晶间β相对α晶粒的转动和滑动起着调节作用;而位错运动既是变形机制,又是晶界滑动的调节机制。 The compressive method was used to study the mechanical behavior and microstructure evolution of Ti75 alloy under superplastic deformation. The results show that under the condition of 800 ℃, 5 × 10-4s-1 and 850 ℃, 1 × 10-1s-1, the value of m is greater than 0.3, while the value of m decreases at 900 ℃. Due to the dynamic Recrystallization and β-phase diffusion, to achieve the equiaxed, fine-grained, homogenized lamellar structure, so that the α grains can slide and rotate, the grain boundary movement as the main deformation mechanism; intergranular β relative α-grain Rotation and sliding play a regulatory role; and dislocation movement is both the deformation mechanism, but also the grain boundary sliding mechanism of regulation.