Glide sequences of deformation in the {111} plane of Ni3Ga single crystals in the yield stress anomaly
Glide sequences of deformation in the {111} plane of Ni3Ga single crystals in the yield stress anomaly
复制标题
Ni3Ga单晶{111}面屈服应力异常的滑移变形序列
DOI：
10.1080/01418619308207141
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
P. Hirsch
中科院分区：
文献类型：
--
作者：
A. Couret;Y. Sun;P. Hirsch
平行于[123]方向取向的Ni 3Ga单晶在屈服应力异常范围内发生形变。在不同温度下对同一试样进行连续变形。用弱束显微镜观察了（111）面位错的亚结构。螺旋位错是Kear-Wilsdorf组态，并包含许多超扭结，其形状进行了分析。观察到了简单的超扭结和非简单的超扭结。超扭折高度的统计分析揭示了两种类型的变形序列。对应于其中一个的锁定过程是热激活的，而另一个具有几何原因。
Abstract Ni3Ga single crystals oriented parallel to the [123] direction were deformed in the range of the yield stress anomaly. Successive deformations have also been performed at different temperatures on the same specimen. The substructure of dislocations in the (111) plane has been observed by weak-beam microscopy. The screw dislocations are in the Kear-Wilsdorf configuration and contain many superkinks, the shape of which has been analysed. Simple superkinks and switchover superkinks have been observed. A statistical analysis of the superkink height has revealed two types of deformation sequence. The locking process corresponding to one of these is thermally activated while that of the other has a geometric cause.