The elastoplastic behaviors of a nickel-based single crystal superalloy at 760 °C, 927 °C and 1100 °C were studied, respectively, after 815 °C/250 MPa lasting for 2000 h, 927 °C/205 MPa lasting for 2000 h and 1100 °C/30 MPa lasting for 1000 h. After 815 °C/250 MPa lasting for 2000 h, the \(\gamma '\) phases still maintain the cubic shape, but their size increases compared with the original microstructure. The values of \(\sigma _{\mathrm{b}}\), \(\sigma _{0.2}\), \(\delta _{5}\) and \(\psi \) increase. The tensile fracture surface is 45° with the [001] direction and the fracture mechanism is octahedral slip. After 927 °C/205 MPa lasting for 2000 h and 1100 °C/30 MPa for 1000 h, N-type plate-like rafting structure formed, and the latter owns a higher degree. The values of \(\sigma _{\mathrm{b}}\) and \(\sigma _{0.2}\) decrease obviously, while \(\delta _{5}\) and \(\psi \) basically are unchanged. The mechanism is the mixed fracture of octahedral slip and I-type. The fatigue verification test and simulation further prove the strengthening effect.

分别研究了镍基单晶高温合金在760℃、927℃和1100℃下的弹塑性行为，815℃/250MPa持续2000h，927℃/205MPa持续2000h和 1100 °C/30 MPa 持续 1000 小时。在 815 °C/250 MPa 持续 2000 h 后，\(\gamma'\)相仍然保持立方体形状，但与原始微观结构相比，它们的尺寸增加。的值\（\西格玛_ {\ mathrm {B}} \） ，\（\西格玛_ {0.2} \） ，\（\增量_ {5} \）和\（\ PSI \）增加。拉伸断裂面与[001]方向成45°，断裂机制为八面体滑移。在927℃/205 MPa持续2000 h和1100℃/30 MPa持续1000 h后，形成N型板状筏板结构，后者具有较高的程度。的值\（\西格玛_ {\ mathrm {B}} \）和\（\西格玛_ {0.2} \）明显减少，而\（\增量_ {5} \）和\（\ PSI \）基本上不变。其机理是八面体滑移和I型的混合断裂。疲劳验证试验和仿真进一步证明了强化效果。