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通过在低温(700~850℃)环境下,对未经预处理的Ti6Al4V合金板材进行超塑性拉伸变形,分析其超塑性变形能力和力学行为,并对其低温超塑性变形机制进行了研究。结果表明:Ti6Al4V合金在常压空气中具有优异的的低温超塑性变形性能;在700~850℃温区内应变速率敏感性指数约为0.3;850℃条件下,Ti6Al4V合金的超塑性变形机制为晶界滑动;700~750℃时合金发生非典型超塑性变形。
The superplastic deformation and mechanical behavior of Ti6Al4V alloy sheet without pretreatment under low temperature (700 ~ 850 ℃) were studied. The mechanism of low temperature superplastic deformation was also studied. The results show that the Ti6Al4V alloy has excellent low temperature superplastic deformation performance in atmospheric air, the strain rate sensitivity index is about 0.3 in the temperature range from 700 to 850 ℃, and the superplastic deformation mechanism of Ti6Al4V alloy is Grain boundary sliding; 700 ~ 750 ℃ when the alloy atypical superplastic deformation.