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采用Gleeble-3800型热模拟试验机研究了高铝Ni3Al基合金在变形温度为1200～1240℃,应变速率为0.01～1s-1条件下的热压缩变形,结果表明:在应变速率为0.01s-1时,高铝Ni3Al基合金对应的热变形本构方程为σ=28.57(lnε+6.72×105/RT-44.08),而当应变速率为0.1s-1和1s-1时,热变形本构方程为σ=28.57(lnε+1.28×106/RT-92.76)。变形过程中只有γ’相发生不同程度上回溶,但未发生动态再结晶。合金的最佳变形区间位于变形温度为1200～1215℃,应变速率为0.01s-1范围内;而当提高速率至1s-1附近,γ’相中塞积的位错容易造成单相γ’区中β/γ’界面的开裂,对应变形过程中的“失稳区”。
The hot compressive deformation of high-aluminum Ni3Al-based alloy was investigated by using Gleeble-3800 thermal simulator at a deformation temperature of 1200-1240 ℃ and a strain rate of 0.01-1s-1. The results show that when the strain rate is 0.01s- 1, the thermal deformation constitutive equation of high-aluminum Ni3Al-based alloy is σ = 28.57 (lnε + 6.72 × 105 / RT-44.08). When the strain rate is 0.1s-1 and 1s-1, The structure equation is σ = 28.57 (lnε + 1.28 × 106 / RT-92.76). During the deformation process, only γ ’phase was dissolved to some extent, but no dynamic recrystallization occurred. The optimum deformation range of the alloy lies in the range of deformation temperature of 1200-1215 ℃ and strain rate of 0.01s-1. When the rate of increase is near 1s-1, dislocations accumulated in the γ ’phase easily cause single-phase γ’ The cracking of the β / γ ’interface in the zone corresponds to the “destabilization zone ” in the deformation process.