Ti-B25合金高温变形时的塑性流动软化行为

通过热模拟压缩实验,研究了变形温度、应变速率对Ti-B25合金高温变形时流动应力和峰值流动应力的影响,并结合组织演变规律揭示了其高温塑性流动软化机理.结果表明:流动应力和峰值流动应力均随变形温度的下降以及应变速率的增大而增大.应变速率为10.0 s-1时,随着变形温度的升高,流动软化程度减小,并且α+β两相区的软化程度...

Plastic Flow Softening Behavior of Ti-B25 Alloy During High Temperature Deformation

The effect of deformation temperature and strain rate on flow stress and peak flow stress of Ti-B25 alloy were investigated through hot compression tests.And the high temperature softening mechanism was revealed based on microstructure evolution.The results show that both the flow stress and peak flow stress increase with the decreasing of deformation temperature and increasing of strain rate.When the strain rate is 10.0 s^-1,the flow softening extent decreases with the increasing of deformation temperature,and the softening extent inα+βphase region is much higher than that inβphase region.The strain rate has a greater effect than the deformation temperature on the temperature rise.When the strain rate is 10.0 s^-1,the temperature rise of Ti-B25 alloy is the highest,and the flow softening extent is also significantly higher than those at other strain rates due to the local plastic flow.When the strain rate is 0.01 s^-1,the temperature rise is very small,but the flow softening also occurs due to the dynamic recrystallization.