Abstract The microstructure of a nickel-based single crystal superalloy has been investigated after creep deformation at 1033 K under stress up to 850 MPa. High density of stacking faults are formed in γ′ precipitates during the creep deformation. At 700 MPa and 850 MPa, bi-directional stacking faults are observed. These stacking faults are induced by the movement of a/3 partial dislocations. Two formation mechanisms of a/3 partial dislocations, reaction and dissociation mechanisms, are simultaneously observed in this alloy after deformation. The proportion of a/3 dislocations formed by the dissociation mechanism increases as the applied stress increases. The primary creep strain of this alloy is 2.45% at 850 MPa, which may be attributed to the combination of these two mechanisms.

中文翻译：

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1033 K高应力下镍基单晶高温合金的蠕变变形

摘要 研究了镍基单晶高温合金在 1033 K 和 850 MPa 应力下蠕变变形后的微观结构。在蠕变变形过程中，γ′相中会形成高密度的堆垛层错。在 700 MPa 和 850 MPa 下，观察到双向堆垛层错。这些堆垛层错是由 a/3 部分位错的运动引起的。变形后在该合金中同时观察到 a/3 部分位错的两种形成机制，反应和解离机制。由解离机制形成的 a/3 位错的比例随着外加应力的增加而增加。该合金在 850 MPa 时的主要蠕变应变为 2.45%，这可能归因于这两种机制的结合。