In situ deformation of proton-irradiated molybdenum in a high-voltage electron microscope
In situ deformation of proton-irradiated molybdenum in a high-voltage electron microscope
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高压电子显微镜下质子辐照钼的原位变形
DOI：
10.1080/01418619108221194
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发表时间：
1991
影响因子：
1.6
通讯作者：
H. Shiraishi
中科院分区：
文献类型：
--
作者：
M. Suzuki;A. Fujimura;A. Sato;J. Nagakawa;N. Yamamoto;H. Shiraishi
摘要用高压电子显微镜原位形变研究了无缺陷区（DFZ）（位错沟道）的形成。利用小型回旋加速器，通过质子辐照在钼单晶中引入了间隙型位错环。该环具有位于{111}平面上的Burgers矢量B =（a/2）。已经表明，这些环被一组运动的位错吸收或带走，导致DFZ的形成。在该区域中的变形被发现终止时消除的循环和捕获的滑移位错在区域矩阵界面壁的位错源耗尽。基于这些观察，形成DFZ所需的临界条件进行了讨论，特别注意屈服不对称性和表面效应。
Abstract Formation of defect-free zones (DFZs) (dislocation channelling) has been examined by in situ deformation in a high-voltage electron microscope. Interstitial-type dislocation loops have been introduced into molybdenum single crystals by proton irradiation using a compact cyclotron. The loops have a Burgers vector of b = (a/2) 〈111〉 lying on a {111} plane. It has been shown that these loops are absorbed or carried away by a group of moving dislocations, resulting in the formation of DFZs. Deformation in the zone is found to terminate by exhaustion of dislocation sources upon elimination of the loops and upon trapping of the glide dislocations at the zone matrix interface walls. Based on these observations the critical conditions required for formation of the DFZ are discussed with particular attention to the yielding asymmetry and the surface effect.