Local disordering and reordering phenomena induced by mobile dislocations in short-range-ordered solid solutions

F. Pettinari-Sturmel, M. Jouiad, H. Kirchner, N. Clément, A. Coujou
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引用次数: 12

Abstract

Abstract Dislocation motion in short-range-ordered solid solutions under stress are investigated in situ by transmission electron microscopy. For the first time, local reordering created by the back slip of mobile dislocations is proven to exist. Dislocation movement within pile-ups produces local disordering by forward slip during loading, and local reordering by back slip during unloading. Within a pile-up, the driving force for this mechanism is the diffuse antiphase-boundary energy created by the movement of the leading dislocation.
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短程有序固溶体中由移动位错引起的局部无序和重有序现象
用透射电镜原位研究了应力作用下短程有序固溶体中的位错运动。首次证明了运动位错后滑移引起的局部重排序的存在。堆体内部的位错运动在加载过程中产生正向滑移的局部无序,在卸载过程中产生反向滑移的局部重新排序。在堆积中,这种机制的驱动力是由主导位错的运动产生的弥漫性反相边界能量。
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