Here, we trace in situ the slip-line formation and morphological signature of dislocation avalanches in a high-entropy alloy with the aim of revealing their microstructural degree of localization. Correlating the intermittent microplastic events with their corresponding slip-line patterns allows defining two main event types, one of which is linked to the formation of new slip lines, whereas the other one involves reactivation of already existing slip lines. The formation of new slip lines reveals statistically larger and faster avalanches. The opposite tendency is seen for avalanches involving reactivation of already existing slip lines. The combination of both these types of events represents the highest degree of spatial avalanche delocalization that spans the entire sample, forming a group of events that determine the truncation length scale of the truncated power-law scaling. These observations link the statistics of dislocation avalanches to a microstructural observable.

中文翻译：

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高熵合金中位错雪崩的微观结构特征

在这里，我们就地追踪揭示高熵合金中位错雪崩的滑移线形成和形态特征，以揭示其微结构的局部化程度。将间歇性微塑性事件与其相应的滑移线样式相关联，可以定义两种主要事件类型，其中一种与新滑移线的形成有关，而另一种涉及重新激活已经存在的滑移线。新滑移线的形成揭示了统计上更大和更快的雪崩。对于涉及重新激活已经存在的滑移线的雪崩，可以看到相反的趋势。这两种类型的事件的组合代表了跨越整个样本的最高程度的空间雪崩离域化，形成一组事件，这些事件确定截断幂律标度的截断长度标度。这些观察将位错雪崩的统计数据与可观察到的微观结构联系起来。