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通过等温热压缩实验研究Ti-6.5Al-2Zr-1Mo-1V合金在温度750~950°C、应变速率0.001~10 s~(-1)条件下的动态等轴化动力学行为。结果表明,层片组织α相的等轴化分数随变形温度升高和应变速率降低而增大,并构建了JMAK型等轴化动力学方程,且方程预测的等轴化动力学曲线与实验值吻合较好。此外,结合SEM和TEM微观组织观察发现,层片组织α相的动态等轴化过程分为两个阶段,首先是由动态再结晶和机械孪晶两个互相竞争的机制引起的晶界分离阶段;第二阶段中β相渗入α/α界面导致等轴化完成,β相渗入α/α界面实质上是由Al、Mo和V等合金元素的扩散造成的。
The isothermal kinetic behavior of Ti-6.5Al-2Zr-1Mo-1V alloy at 750 ~ 950 ° C and strain rate of 0.001 ~ 10 s ~ (-1) was investigated by isothermal hot compression experiment. The results show that the equiaxed fraction of α phase of lamellar structure increases with the increase of deformation temperature and strain rate, and the isokinetic equation of JMAK type is established. And the isokinetic curve predicted by equation and experiment The values match well. In addition, combined with SEM and TEM microstructure observation, it was found that the dynamic equiaxed phase of the α phase of the lamellar structure is divided into two stages. The first stage is the grain boundary separation stage caused by two competing mechanisms of dynamic recrystallization and mechanical twinning In the second phase, the β phase infiltrated into the α / α interface resulted in the equiaxialization. The β phase infiltrated into the α / α interface is essentially caused by the diffusion of alloying elements such as Al, Mo and V.