Stress-rupture properties of a Ni-base Re-containing single-crystal superalloy with three orientations have been tested under 900 °C/445 MPa. An obvious anisotropy of stress-rupture property is attributed to orientation reliant deformation microstructure. The good strength in [001] orientation is attributed to the rapid multiplication of dislocations active in horizontal channels and later γ’ cutting via dislocations pair coupled with anti-phase boundary. The microtwin formation largely limits the strength and plasticity as a result of the continuous shearing across γ/γ’ microstructure by {111}〈112〉 slip activated in [011] orientation. The property in [111] orientation results mainly from the lateral cross-slip movements of the screw dislocations within connected matrix channels as well as the precipitate shearing by coplanar dislocations. Microcracks all initially originate from the interdendritic micropores in three orientations. The critical temperature of stress-rupture anisotropy could be increased by a high level of refractory solutes especially Re.

已经在900°C / 445 MPa下测试了具有三个取向的含Ni基Re的单晶高温合金的应力断裂性能。应力-断裂特性的明显各向异性归因于取向相关的变形微观结构。[001]方向的良好强度归因于水平通道中活跃的位错的快速繁殖，以及后来通过位错对和反相边界对γ'的切割。由于在γ / γ'上连续剪切，微孪晶的形成极大地限制了强度和可塑性由{111} 〈112〉滑移形成的微结构以[011]取向。[111]取向的特性主要是由于所连接的基体通道内螺旋位错的横向横向滑动运动以及共面位错对沉淀物的剪切作用所致。最初，所有微裂纹都来自树突间微孔的三个方向。高含量的难熔溶质，尤其是Re，可以提高应力断裂各向异性的临界温度。