论文部分内容阅读
采用拉伸测试、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等手段研究了第二代单晶高温合金DD6在760℃和1070℃拉伸行为与变形机制。结果表明:DD6单晶高温合金760℃拉伸变形时,大量位错和层错切割γ’相,出现热激活硬化,拉伸应力-应变曲线表现双重阶段,断口为类解理断裂特征;1070℃拉伸变形时,位错主要以绕过γ’相方式在γ相通道运动,拉伸应力-应变曲线表现曲线特征,断口为韧窝断裂特征。
The tensile behavior and deformation mechanism of the second generation single crystal superalloy DD6 at 760 ℃ and 1070 ℃ were investigated by tensile test, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that during the tensile deformation of DD6 single crystal superalloy at 760 ℃, a large number of dislocations and layer-cut γ ’phases are formed, which result in heat-activated hardening. The tensile stress-strain curves show double phases and the fracture-like fracture- At the tensile deformation, the dislocations mainly move around the γ phase through the γ ’phase. The tensile stress-strain curve shows the curve characteristics, and the fracture is the dimple fracture feature.