کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
787538 | 1465680 | 2008 | 20 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigation of three-dimensional aspects of grain-scale plastic surface deformation of an aluminum oligocrystal Investigation of three-dimensional aspects of grain-scale plastic surface deformation of an aluminum oligocrystal](/preview/png/787538.png)
This is a study of plastic strain localization, surface roughening and of the origin of these phenomena in polycrystals. An oligocrystal aluminum sample with a single quasi-2D layer of coarse grains is plastically deformed under uniaxial tensile loading. During deformation, the history of strain localization, surface roughening, microstructure and in-grain fragmentation is carefully recorded. Using a crystal plasticity finite element model, corresponding high-resolution simulations are conducted. A series of comparisons identifying aspects of good and of less good match between model predictions and experiments is presented. The study suggests that the grain topology and microtexture have a significant influence on the origin of strain heterogeneity. Moreover, it suggests that the final surface roughening profiles are related both to the macro strain localization and to the intra-grain interaction. Finally slip lines observed on the surface of the samples are used to probe the activation of slip systems in detail. The study concludes with an assessment of the limitations of the crystal plasticity model.
Journal: International Journal of Plasticity - Volume 24, Issue 12, December 2008, Pages 2278–2297