Quantifying elastic strain near coherent twin interface in magnesium with nanometric resolution

Quantifying elastic strain near coherent twin interface in magnesium with nanometric resolution
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以纳米分辨率量化镁中相干孪晶界面附近的弹性应变

DOI:
10.1016/j.matchar.2019.110082
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发表时间:
2020-02
影响因子:
4.7
通讯作者:
Carlos N.Tomé
Carlos N.Tomé
中科院分区:
材料科学1区
文献类型:
--
作者:
Jinsong Chen;Yue Liu;Rodney J McCabe;Jian Wang;Carlos N.Tomé

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与形变孪晶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,我们修改了一个标准的峰对算法(PP)提取的局部弹性应变场与双胞胎在Mg从观察到的原子结构。我们还使用纳米束电子衍射(NBED)的方法进行比较,并在几个位置的内部和附近的孪晶的应变场的特征。结果显示:(1)在基底-棱柱界面附近的应力集中比共格孪晶界处大得多;(2)在孪晶尖端前面的基体中的应力集中似乎与位错堆积有关。这项工作提供了洞察力在纳米尺度上的弹性应变场与弹性和塑性变形在孪晶界面附近。
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.
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