کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5435990 1509542 2017 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanovoid failure in Magnesium under dynamic loads
ترجمه فارسی عنوان
شکست نانوایی در منیزیم تحت بارهای پویا
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

The dynamic behavior of Magnesium (Mg) single crystals containing nano-sized voids and the mechanisms responsible for failure under different loading conditions are studied by means of Molecular Dynamics (MD) simulations. Our study reveals that the response is highly anisotropic leading to a brittle to ductile transition in the failure modes under different load orientations. This transition is accompanied by different mechanisms of deformation and is associated with the anisotropic Hexagonal Close Packed (HCP) lattice structure of Mg and the associated barrier for dislocation motion. Remarkably, brittle failure is observed when external loads produce a high stress triaxiality while the response is more ductile when the stress triaxiality decreases. The fundamental mechanisms observed in the simulations, therefore, explain the low spall strength of Mg and suggest the possibility of manipulating some mechanisms to increase ductility and spall strength of new lightweight Mg alloys.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 134, 1 August 2017, Pages 360-374
نویسندگان
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