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首页> 外文期刊>Materials Science and Engineering >Evolution of dislocation patterns inside the plastic zone introduced by fatigue in an aged aluminium alloy AA2024-T3
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Evolution of dislocation patterns inside the plastic zone introduced by fatigue in an aged aluminium alloy AA2024-T3

机译:老化铝合金AA2024-T3中疲劳引起的塑性区内位错模式的演变

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摘要

The formation of dislocations patterns within the plastic zone ahead of a crack tip introduced by fatigue loading in AA2024-T3 sheets is studied by electron channelling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). The aim lies in correlating local plastic effects at grain level with digital image correlation (DIC) results obtained at coarser resolution. While dislocation patterns are observed already prior to fatigue loading, the presence of dislocation sources and dislocation entanglements increases towards highly deformed regions near the crack path. Also, deformation veins are revealed by EBSD in grains located along the crack path. Based on ECCI and EBSD the dislocation density was determined and shows a gradient towards the crack tip. The results help linking the process of fatigue deformation at grain-level to the deformation field probed at the meso-scale level.
机译:通过电子通道对比成像(ECCI)和电子背散射衍射(EBSD)研究了AA2024-T3薄板中疲劳载荷在裂纹尖端前的塑性区中位错图案的形成。目的在于将晶粒水平的局部塑性效应与在较粗分辨率下获得的数字图像相关性(DIC)结果相关联。尽管在疲劳载荷之前就已经观察到位错模式,但位错源和位错缠结的存在朝向裂纹路径附近的高度变形区域增加。此外,EBSD会在沿裂纹路径定位的晶粒中显示出变形脉。基于ECCI和EBSD,确定了位错密度,并显示了朝向裂纹尖端的梯度。结果有助于将晶粒度疲劳变形的过程与中尺度度探测的变形场联系起来。

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