Caution in building a Burgers circuit for studying secondary dislocations

Caution in building a Burgers circuit for studying secondary dislocations
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构建用于研究二次位错的伯格斯电路时的注意事项

DOI:
10.1016/j.jmst.2019.01.004
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发表时间:
2019-06
影响因子:
10.9
通讯作者:
Zhang Wen Zheng
Zhang Wen Zheng
中科院分区:
材料科学1区
文献类型:
--
作者:
Xu Wen Sheng;Zhang Wen Zheng

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由于二次位错的Burgers矢量可能与高分辨率透射电子显微镜(HRTEM)图像中的周期图案中的平移矢量不一致,因此根据HRTEM图像直接构建的Burgers电路可能会呈现错误的Burgers矢量。以 Inconel 718 合金中 δ 析出物的习性平面 (HP) 的 HRTEM 图像为例,通过使用不同的 Burgers 电路重新检查。发现了与下台阶相关的预测二次位错的证据。位错的 Burgers 矢量为 1/6 [11 2´] γ/1/3 [00 1´] δ,由建立在位移完全位移晶格 (DSCL) 参考上的 Burgers 电路确定。与习惯面主要缺陷的计算结果和实测结果一致。定量地解释了由于不同的伯格斯电路而产生的不同的伯格斯向量。本研究对于确定其他系统中二次界面位错的伯格斯矢量具有一般意义。
As the Burgers vector of a secondary dislocation may not conform to the translation vectors in the periodic pattern in a high-resolution transmission electron microscope (HRTEM) image, a Burgers circuit directly constructed according to an HRTEM image may render a wrong Burgers vector. The HRTEM images of the habit plane (HP) of δ precipitate in an Inconel 718 alloy were re-examined by using different Burgers circuits, as an example. Evidence is found for predicted secondary dislocation associated with a down step. The Burgers vector of the dislocation is 1/6 [11 2¯] γ/1/3 [00 1¯] δ, determined with the Burgers circuit built on the reference of the displacement shift completely lattice (DSCL). It is consistent with both the calculated and the measured result of the major defects in the habit plane. Different Burgers vectors due to different Burgers circuits were explained quantitatively. The present study has a general implication for the determination of the Burgers vectors of secondary interfacial dislocations in other systems.
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