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采用热压缩试验方法,对Ti-5553钛合金的动态再结晶行为进行研究。结果表明,在温度800～860℃、应变速率0.01～10s-1的范围内,Ti-5553合金在高温、低应变速率变形时,晶界弓出形核是其主要的动态再结晶形核机制;在低温、高应变速率、大变形量变形时,位错塞积形核是主要的动态再结晶形核机制。在非均匀变形的条件下材料产生绝热剪切现象,其形核主要以亚晶吞并长大形核机制进行。
The dynamic recrystallization behavior of Ti-5553 titanium alloy was studied by hot compression test. The results show that the grain boundary nucleation is the main dynamic recrystallization nucleation mechanism of Ti-5553 alloy at high temperature and low strain rate at the temperature of 800-860 ℃ and the strain rate of 0.01-10s-1 At the low temperature, high strain rate and large deformation deformation, dislocation plug nucleation is the main dynamic recrystallization nucleation mechanism. Under non-uniform deformation conditions, the material produces adiabatic shear phenomenon, and its nucleation is mainly carried out by means of subgrain engulfing and growth nucleation.