Effect of grain orientation on deformation structure in cold-rolled polycrystalline aluminium
Effect of grain orientation on deformation structure in cold-rolled polycrystalline aluminium
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DOI：
10.1016/s1359-6454(98)00229-8
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发表时间：
1998-10
期刊：
影响因子：
9.4
通讯作者：
Q. Liu;D. Jensen;N. Hansen
中科院分区：
文献类型：
--
作者：
Q. Liu;D. Jensen;N. Hansen
将纯（99.996%）多晶铝（晶粒尺寸约300μm）冷轧至变形量5 ~ 50%（εvm=0.06-0.80），用透射电镜分析了大量晶粒的变形组织。根据变形晶粒的取向，变形显微组织被具有不同特性的位错边界细分。基于弗兰克公式的位错边界的分析表明，在边界中的大多数位错来自主动滑移系统预测的施密德因子分析。因此，在微观组织演变和宏观塑性行为之间建立了联系。边界参数也被用于计算不同取向晶粒的位错密度和储能。这些计算与测量的角度取向差分布表明，晶粒取向的差异所造成的微观结构的差异，随着应变的增加而增强。
Pure (99.996%) polycrystalline aluminium (grain size about 300μm) has been cold-rolled to reductions in the range from 5 to 50% (εvm=0.06–0.80) and the deformation microstructure has been analysed by TEM in a large number of grains. The deformation microstructure is subdivided by dislocation boundaries having different characteristics depending on the orientation of the deformed grain. An analysis of the dislocation boundaries based on Frank's formula shows that the majority of the dislocations in the boundaries originate from active slip systems predicted by a Schmid factor analysis. Thereby a link is created between the microstructural evolution and the macroscopic plastic behaviour. The boundary parameters have also been used in a calculation of the dislocation density and the stored energy for grains of different orientations. These calculations together with measurements of the angular misorientation distribution shows that microstructural differences caused by differences in grain orientation are enhanced as the strain is increased.