Changes in the burgers vector of perfect dislocation loops without contact with the external dislocations
Changes in the burgers vector of perfect dislocation loops without contact with the external dislocations
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DOI：
10.1103/physrevlett.96.125506
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发表时间：
2006-03-31
影响因子：
8.6
通讯作者：
Mori, H
中科院分区：
文献类型：
--
作者：
Arakawa, K;Hatanaka, M;Mori, H
本文报道了用透射电子显微镜原位观察位错伯格斯矢量的一种新的变化过程。体心立方铁中直径小于约50 nm的小位错环由1/2< 111 >位错环转变为另一个1/2< 111 >位错环或能量不利< 100 >位错环，并由1/2位错环< 100 >转变为1/2< 111 >位错环。这些转变发生在高能电子辐照或简单加热而不接触外部位错。这些现象的起源进行了讨论。
We report the observations of a new type of changing process in the Burgers vector of dislocations by in situ transmission electron microscopy. Small interstitial-type perfect dislocation loops in bcc iron with diameters less than approximately 50 nm are transformed from a 1/2 < 111 > loop to another 1/2 < 111 > one or an energetically unfavorable < 100 > one; furthermore, a < 100 > loop is transformed to a 1/2 < 111 > one. These transformations occurred on high-energy electron irradiation or simple heating without contact with external dislocations. The origin of these phenomena is discussed.