کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1450529 988737 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simulation and analysis of the migration mechanism of Σ5 tilt grain boundaries in an fcc metal
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Simulation and analysis of the migration mechanism of Σ5 tilt grain boundaries in an fcc metal
چکیده انگلیسی

The atomistic mechanism by which grain boundaries migrate is important for understanding the relationship between their structures and dynamical properties. We perform a series of three-dimensional molecular dynamic simulations of the migration of Σ5 tilt grain boundaries of different inclinations in nickel. We identify the migration mechanism through frequent quenches and analysis of the atomic displacements, local and global excess volume, and stress. The migration mechanism has the following components: local volume fluctuations precede the displacements of 3–4 linear atomic clusters in the direction parallel to the tilt axis which, in turn, are followed by individual atomic hops that are primarily perpendicular to the boundary plane. Excess volume is key to both the volume fluctuations and the atomic hops perpendicular to the boundary plane. The linear, or string-like, atomic motion parallel to the tilt axis also gives rise to a strong anisotropy in the grain boundary self-diffusivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 54, Issue 3, February 2006, Pages 623–633
نویسندگان
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