高铝Ni_3Al基合金的热变形行为  

Hot Deformation Behaviour of Ni_3Al-based Alloy with High Al Content

作　　者：张喜娥[1] 付珊珊 骆合力[1] 韩少丽[1] 李尚平[1] 

机构地区：[1]钢铁研究总院高温材料研究所,北京100081 [2]贵州黎阳航空动力有限公司,贵阳561114

出　　处：《航空材料学报》2013年第1期14-20,共7页Journal of Aeronautical Materials

摘　　要：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"。High temperature compression deformation of the Ni3Al-based alloy with high Al content was investigated by thermal simulation machine Gleeble-3800 with the strain rate of 0.01～1 s-1 at 1200～1240℃.Thermal deformation constitutive equation was established for the alloy. The results reveal that the thermal deformation constitutive equation was σ=28.57（lnε＋6.72×105/RT-44.08） when the strain rate was 0.01s-1 while the thermal deformation constitutive equation was σ=28.57（lnε＋1.28×106/RT-92.76）when the strain rate was 0.1s-1 and 1s-1. There was only the γ＇ phase re-dissolving to varying degrees, but without the dynamic recrystallization happened.The optimal deformation parameters for the alloy were at the temperature of 1200℃～1215℃, with the strain rate was 0.01s-1. While when the strain rate increased to 1s-1, due to the locked dislocation in the γ＇ phase can not got released, so the β/γ＇ interface was liable to be cracked on the area of single γ＇ phase, and that deformation condition was corresponded to the ＂destabilization area＂.

关 键 词：高铝Ni3Al基合金 热变形本构方程 安全变形区 失稳区 

分 类 号：V223[航空宇航科学与技术—飞行器设计] V215.5