Physics 版 (精华区)
发信人: zjliu (秋天的萝卜), 信区: Physics
标 题: 金颗粒边界六方密堆的几何起源
发信站: 哈工大紫丁香 (Sat May 24 13:38:08 2003) , 转信
发信站: 瀚海星云
http://www.sciencemag.org/cgi/content/abstract/300/5623/1272
Geometric Origin of Hexagonal Close Packing at a Grain Boundary in Gold
G. Lucadamo and D. L. Medlin*
Using electron microscopy, we identify local, intergranular regions of
hexagonal close-packing at a grain boundary in gold. By analyzing the
topological defects that connect this layer to the adjacent face-centered
cubic grains, we explain the geometric origin of this interfacial
reconstruction. We extend this analysis to predict the stacking
arrangements found over a range of intergranular misorientations. These
results help to unify our understanding of the defects that control the
behavior of polycrystalline materials by showing how line defects that are
already well understood in the bulk also can determine the atomic
arrangements at grain boundaries.
Department of Thin Film and Interface Science, Sandia National
Laboratories, Post Office Box 969, Livermore, CA 94551, USA.
* To whom correspondence should be addressed. E-mail: dlmedli@sandia.gov
Volume 300, Number 5623, Issue of 23 May 2003, pp. 1272-1275.
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