ABSTRACT Stacking fault tetrahedra (SFTs) are known to form during the rolling process of face-centered cubic metals and to deteriorate their structural properties. However, the atomistic mechanism of formation and destruction of SFTs during such material processing is still unclear. We have performed molecular dynamics simulations of the nanoscale cryo-rolling process for single-crystal nickel and here report the mechanism behind the formation and collapse of SFTs. It is found that SFTs are formed through dissociation of Shockley partial dislocation loops in the specimen. On the other hand, destruction of SFTs occurs under compressive stress and follows an inverse Silcox-Hirsch mechanism.

中文翻译：

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单晶镍层错四面体在纳米级低温轧制过程中的动态形成与破坏过程

摘要 众所周知，在面心立方金属的轧制过程中会形成堆垛层错四面体 (SFTs)，并会降低其结构性能。然而，在这种材料加工过程中，SFTs 形成和破坏的原子机制尚不清楚。我们对单晶镍的纳米级低温轧制过程进行了分子动力学模拟，并在此报告了 SFT 形成和坍塌背后的机制。发现 SFT 是通过试样中肖克利部分位错环的解离形成的。另一方面，SFTs 的破坏发生在压缩应力下，并遵循反向 Silcox-Hirsch 机制。