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对GH4720Li合金在1080~1180℃、应变速率为0.01~10 s~(-1)条件下的单道次压缩变形行为进行了研究。利用压缩实验的应力-应变关系曲线,计算了变形条件下的热变形激活能,建立了相应的本构方程和热加工图。结果表明:动态再结晶是GH4720Li合金的主要软化机制;合金在1120~1180℃、应变速率在0.1~1 s~(-1)、真应变0.7时实现完全动态再结晶,最佳变形温度为1120~1140℃;γ′相的析出行为引起峰值应力和热变形激活能显著变化;热变形激活能在1160℃,达到最小值602 k J/mol;应变速率达到1 s~(-1)以上,合金出现失稳现象。
The single pass compression deformation behavior of GH4720Li alloy at 1080 ~ 1180 ℃ and strain rate of 0.01 ~ 10 s ~ (-1) was studied. Using the stress-strain curve of the compression experiment, the thermal deformation activation energy was calculated and the corresponding constitutive equations and the hot working diagram were established. The results show that the dynamic recrystallization is the main softening mechanism of GH4720Li alloy. The complete dynamic recrystallization of the alloy is obtained at 1120 ~ 1180 ℃, strain rate of 0.1 ~ 1 s -1 and true strain of 0.7. The optimum deformation temperature is 1120 ℃ ~ 1140 ℃. The precipitation behavior of γ ’phase caused a significant change in peak stress and thermal deformation activation energy. The thermal deformation activation energy reached the minimum of 602 kJ / mol at 1160 ℃, and the strain rate reached 1 s ~ (-1) Alloy instability phenomenon.