کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1562031 1513956 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical exploration of plastic deformation mechanisms of copper nanowires with surface defects
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
Numerical exploration of plastic deformation mechanisms of copper nanowires with surface defects
چکیده انگلیسی

Based on the molecular dynamics simulation, plastic deformation mechanisms associated with the zigzag stress curves in perfect and surface defected copper nanowires under uniaxial tension are studied. In our previous study, it has found that the surface defect exerts larger influence than the centro-plane defect, and the 45° surface defect appears as the most influential surface defect. Hence, in this paper, the nanowire with a 45° surface defect is chosen to investigate the defect’s effect to the plastic deformation mechanism of nanowires. We find that during the plastic deformation of both perfect and defected nanowires, decrease regions of the stress curve are accompanied with stacking faults generation and migration activities, but during stress increase, the structure of the nanowire appears almost unchanged. We also observe that surface defects have obvious influence on the nanowire’s plastic deformation mechanisms. In particular, only two sets of slip planes are found to be active and twins are also observed in the defected nanowire.


► Perfect and surface defected nanowires under tension are thoroughly simulated.
► Plastic deformation mechanisms for zigzag stress curves are carefully explored.
► Stress decrease regions are accompanied with SFs’ generation and migration.
► The nanowire’s structure remains unchanged within stress increase regions.
► Obvious influence on deformation mechanisms is found due to surface defects.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 50, Issue 12, December 2011, Pages 3425–3430
نویسندگان
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