کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1563511 999612 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Atomistic simulation on size-dependent yield strength and defects evolution of metal nanowires
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
Atomistic simulation on size-dependent yield strength and defects evolution of metal nanowires
چکیده انگلیسی

A simple derivation based on continuum mechanics is given, which shows the surface stress is critical for yield strength at ultra-small scales. Molecular dynamics (MD) simulations with modified embedded atom method (MEAM) are employed to investigate the mechanical behaviors of single-crystalline metal nanowires under tensile loading. The calculated yield strengths increasing with the decrease of the cross-sectional area of the nanowires are in accordance with the theoretical prediction. Reorientation induced by stacking faults is observed at the nanowire edge. In addition, the mechanism of yielding is discussed in details based on the snapshots of defects evolution. The nanowires in different crystallographic orientations behave differently in stretching deformation. This study on the plastic properties of metal nanowires will be helpful to further understanding of the mechanical properties of nanomaterials.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 46, Issue 1, July 2009, Pages 142–150
نویسندگان
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