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Post-creep strain of Ni_3Al at 380℃

机译：Ni_3Al在380℃下的蠕变后应变

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Post-creep strain tests on single crystal Ni3Al have been conducted at 380degreeC (far below the peak temperature Tp of flow stress) after creep at the same temperature. When specimens were crept at about 225 MPa (just below the conventional yield stress) for 45 h to a plastic strain of about 0.5% and then deformed 2% at a constant strain rate (10-4s-1) at the same temperature, it was found that dislocation structures were different from those observed after constant strain-rate deformation at the same temperature on annealed specimens. Dislocations are mainly on the cube cross-slip plane in the pre-crept specimens instead of on octahedral planes as in conventional annealed specimens. The dislocations exhibit quite a curved morphology although screw and near-screw segments predominate. Although the dislocations are gliding on the cube plane, super or double Lomer-Cottrell locks of the edge segments are not common.
机译：在相同温度下蠕变后，已在380℃（远低于流动应力的峰值温度Tp）下对Ni3Al单晶进行了蠕变后测试。当样品在约225 MPa（仅低于常规屈服应力）下蠕变45 h达到约0.5％的塑性应变，然后在相同温度下以恒定应变率（10-4s-1）变形2％时，结果发现，位错结构与退火样品在相同温度下恒定应变率变形后观察到的结构不同。位错主要在预蠕变试样中的立方体交叉滑动面上，而不是像常规退火试样中那样在八面体面上。位错表现出相当弯曲的形态，尽管螺段和近螺段占主导。尽管位错在立方体平面上滑动，但边缘段的超级或双重Lomer-Cottrell锁并不常见。

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