کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7882403 1509607 2014 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Micromechanics of tensile twinning in magnesium gleaned from molecular dynamics simulations
ترجمه فارسی عنوان
میکرومکانیک کشش دوگانه در منیزیم که از شبیهسازیهای پویایی مولکولی حاصل شده است
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
This work discusses coarse-grained micromechanics of tensile twinning in magnesium (Mg) extracted from molecular dynamics (MD) simulations. We perform MD simulations on Mg single crystal orientations with initial idealized defect structures at temperatures T=5K and 300K. A detailed atomistic analysis reveals that tensile loading along the c-axis of a defective crystal causes an initial incomplete slip ahead of the defect on the first-order pyramidal 〈c+a〉 planes, followed by the formation of a {112¯1} twin embryo and basal dislocation. These mechanisms aid the formation of {101¯2} twins, which evolve rapidly while {112¯1} twins disappear. We present a micromechanics picture of the deformation-induced twin structure evolution that is tracked by incorporating a twin orientation analysis (TOA) scheme within Open Visualization Tool. The functional dependencies of the volume fraction (v.f.) and number of twins on the overall plastic strain extracted from this analysis provide a basis to construct kinetic laws for twin evolution in terms of nucleation, growth and coalescence. Preliminary results indicate that {101¯2} v.f. evolution is dominated by twin growth in the presence of defects at room temperature, and it may not be strongly rate dependent.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 69, May 2014, Pages 326-342
نویسندگان
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