低层错能镍基单晶高温合金压缩行为和变形组织的温度相关性（英文）

在室温至1000℃的范围内，研究温度对一种低层错能镍基单晶高温合金压缩行为和变形组织的影响。研究结果表明，压缩行为和变形组织均表现出温度相关性。室温下该合金具有较高屈服强度，600℃时屈服强度有所下降；随后，随着温度的升高，屈服强度持续增加，并在800℃时达到最大值；在800℃以上时，屈服强度迅速降低。通过透射电子显微镜观察揭示合金变形机制。位错缠结和位错对塞积是室温下屈服强度较高的主要原因。在600℃时，变形机制从反相畴界切割向堆垛层错切割转变，这导致屈服强度略有下降。在800℃时，变形机制以堆垛层错切割为主，而Lomer-Cottrell锁和不同方向堆垛层错之间的反应导致最大的屈服强度。在900℃及以上时，虽然仍存在一些层错，但主要变形机制为位错绕过机制。最后，讨论变形机制和压缩行为的温度依赖性。

Temperature dependence of compressive behavior and deformation microstructure of a Ni-based single crystal superalloy with low stacking fault energy

The effect of temperature on the compressive behavior and deformation mechanism of a Ni-based single crystal superalloy with low stacking fault energy was investigated in the temperature range from room temperature to 1000 °C. The results indicated that both the compressive behavior and deformation microstructure were temperature- dependent. There was a higher yield strength at room temperature and then the yield strength decreased at 600 °C. After that, the yield strength would increase continuously to the maximum at 800 °C and then decrease rapidly. Furthermore, the deformation mechanisms were revealed by transmission electron microscope observation. The dislocation tangle and dislocation pairs pile-up were the main reasons for the higher yield strength at room temperature. At 600 °C, the transition in the deformation mechanisms from anti-phase boundary shearing to stacking fault shearing accounted for the slight decrease of the yield strength. At 800 °C, the deformation mechanism was mainly controlled by stacking fault shearing and the reaction of stacking faults along different directions as well as Lomer?Cottrell locks was responsible for the maximum yield strength. Above 900 °C, the primary deformation mechanism was the by-passing of dislocations, although there were still some stacking faults. Finally, the temperature dependence of deformation mechanism and compressive behavior was discussed.