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基于热模拟压缩试验,计算了β-CEZ钛合金在不同工艺参数条件下的应变速率敏感性指数、应变硬化指数和表观变形激活能,分析了各参量的变化规律。结果表明:相变点1163 K以下,应变速率敏感性指数随应变的增大而缓慢减小;相变点1163 K以上,应变速率敏感性指数随应变的增大呈波浪状变化。应变一定时,应变速率敏感性指数随变形温度的升高而增大。应变速率为0.01、0.1、10.0 s~(-1)时,应变硬化指数在所有变形温度下几乎都为负值,并且从整体来看,应变硬化指数随变形温度升高而增大。在(α+β)相区,表观变形激活能随应变的增加先增大后减小;在β相区,表观变形激活能随应变的增大变化较小。(α+β)相区和β相区的表观变形激活能相差很大,分别为354.88、193.72 kJ·mol~(-1)。
Based on the thermal simulation compression test, the strain rate sensitivity index, strain hardening index and apparent deformation activation energy of β-CEZ titanium alloy under different process parameters were calculated, and the variation rules of each parameter were analyzed. The results show that the strain rate sensitivity index decreases slowly with the increase of strain at the phase transition point of 1163 K, and the strain rate sensitivity index fluctuates with the increase of strain when the transformation temperature is above 1163 K. When the strain is constant, the strain rate sensitivity index increases with the deformation temperature. At strain rates of 0.01, 0.1 and 10.0 s ~ (-1), the strain hardening index is almost negative at all deformation temperatures, and as a whole, the strain hardening index increases with increasing deformation temperature. In the (α + β) phase, the apparent activation energy first increases and then decreases with the increase of strain. In the β phase, the apparent activation energy changes little with the increase of strain. The apparent activation energies of (α + β) phase and β phase are quite different, which are 354.88 and 193.72 kJ · mol -1, respectively.