Abstract The localized plastic shear associated with deformation twinning induces both, dislocation emission and elastic strain fields near twin interfaces. In this work, we modified a standard peak-pair algorithm (PP) to extract the local elastic strain field associated with twins in Mg from the observed atomic structure. We also used nano-beam electron diffraction (NBED) method for comparison and to characterize the strain field at several positions inside and in the vicinity of a twin. The results reveal: (1) a much larger stress concentration near the basal-prismatic interface than at the coherent twin boundary; (2) a stress concentration in the matrix ahead of the twin tip that seems to be associated with dislocation pileups. This work provides insight at the nanometric scale about the elastic strain field associated with both elastic and plastic deformation in the vicinity of twin interfaces.

中文翻译：

---

以纳米分辨率量化镁中相干孪晶界面附近的弹性应变

摘要 与变形孪生相关的局部塑性剪切在孪晶界面附近引起位错发射和弹性应变场。在这项工作中，我们修改了标准峰对算法 (PP)，以从观察到的原子结构中提取与镁中孪晶相关的局部弹性应变场。我们还使用纳米束电子衍射 (NBED) 方法进行比较并表征双胞胎内部和附近几个位置的应变场。结果表明：（1）基底-棱柱界面附近的应力集中比相干孪晶边界大得多；(2) 基体中孪晶尖端前的应力集中，似乎与位错堆积有关。