Deformation nanotwins in coarse-grained aluminum alloy at ambient temperature and low strain rate
Deformation nanotwins in coarse-grained aluminum alloy at ambient temperature and low strain rate
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DOI：
10.1016/j.msea.2014.10.085
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发表时间：
2015-01
期刊：
影响因子：
6.4
通讯作者：
Zhu Xu;Ning Li;Huawen Jiang;Lin Liu
中科院分区：
文献类型：
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作者：
Zhu Xu;Ning Li;Huawen Jiang;Lin Liu
为了揭示粗晶铝/铝合金在正常实验条件下可能发生变形孪晶，采用常温下准静态压缩粗晶5A02-O铝合金，并进行高分辨率透射电子分析。结果表明，试样在大应变作用下，具有2个原子面厚度的薄片状结构产生了一些长条纹，而在较小的塑性应变作用下，条纹特征消失。快速傅里叶变换和理论分析表明，这些长条纹是纳米孪晶，是由大塑性应变触发的相邻滑移面上的肖克利部分位错形成的层错带重叠而成的。
In order to reveal the possible occurrence of deformation twins in coarse-grained aluminum/aluminum alloy at normal experimental conditions, a 5A02-O aluminum alloy with coarse grains was compressed quasi-statically to various plastic strains at ambient temperature, followed by high-resolution transmission electron analysis. The results revealed some long streaks produced by the thin plate-like structure with 2 atomic planes thick in the specimen undergoing a large strain, while under a relatively small plastic strain, the striped characteristics disappeared. The fast Fourier transform and theoretical analysis have shown that these long streaks are nanotwins, derived from the overlapping of stacking fault ribbons formed by Shockley partial dislocation on adjacent slip planes, which are triggered by the large plastic strain.