在THERMECMASTOR-Z型热模拟试验机上对原始等轴组织的TC11钛合金进行热压缩实验,采用基于Murty准则的加工图技术研究该合金在990-1080℃、0.001-70 s-1变形参数范围内的微观变形机制和流变失稳现象, 并优化该合金的高温变形参数.结果表明, α+β两相区的较佳变形参数为990-1008℃、0.001-0.02 s-1, 以990℃、0.001 s-1附近为最佳, 其变形机制为超塑性. 在β单相区, 中等变形程度(ε<0.6)下的较佳参数为1030-1080℃、0.001-0.1 s-1, 以1060-1080℃、0.001 s-1附近为最佳, 其变形机制为动态再结晶; 而大变形程度(ε>0.6)下的较佳参数为1020-1060℃、0.004-0.6 s-1, 以1040-1050℃、0.016-0.07 s-1附近为最佳, 其变形机制也是动态再结晶.失稳区出现在β单相区内, 其参数范围为1000-1080℃、4.0-70 s-1, 在该失稳区会出现晶粒的不均匀变形;应变速率在0.001 s-1附近时, 在β单相区变形会出现β晶粒的动态粗化.
Hot compression tests of TC11 titanium alloy with equiaxed starting microstructure were conducted by using the Thermecmastor-Z hot working simulator. Microstructural deformation mechanisms and the manifestations of flow instability were investigated by means of processing map’ technology based on Murty criterion, and deformation thermomechanical parameters were optimized in the temperature range 990℃～1008℃ and strain rate range 0.001 s-1～70s-1. The results showed that，in phase，the desired deformation thermomechanical parameters were in 990℃～1008℃ and 0.001 s-1～0.02 s-1 with the deformation mechanism of superplasticity，and the optimum deformation thermomechanical parameters were in the order of 990℃ and 0.001 s-1.In phase，the desired deformation thermomechanical parameters were in 1030℃～1080℃ and 0.001 s-1～0.1 s-1 at the strains below 0.6 and in 1020℃～1060℃ and 0.004s-1～0.6 s-1 at the strains beyond 0.6，both of the two regions underwent dynamic recrystallization，and the corresponding optimum deformation thermomechanical parameters were respectively in 1060℃～1080℃and 0.001 s-1 , 1040℃～1050℃ and 0.016 s-1～0.07 s-1. The region of flow instability occurred in the temperature range 1000℃～1080℃and strain rate 4.0 s-1～70 s-1 in phase，and the manifestations of flow instability is non-uniform deformation of grains. In phase , dynamic growth of grains would occur approximately at the strain rate of 0.001 s-1.
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