کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10620197 988603 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Atomistic simulations of surface cross-slip nucleation in face-centered cubic nickel and copper
ترجمه فارسی عنوان
شبیه سازی اتومیستیک از هسته ی لغزش سطحی در نیکل مکعبی و مس در محور مرکزی
کلمات کلیدی
لغزش سطحی، شبیه سازی اتومیستیک، پتانسیل اتم جاسازی شده، نیکل، فلز مس،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
In this manuscript, embedded atom potentials are used to determine the various core structures of glide screw-character dislocations intersecting free surfaces at right and inclined angles in face-centered cubic Ni and Cu. It is shown that the negative constriction forms at free surfaces under certain conditions. The role of various factors affecting the formation of negative constriction at the free surface, negative constriction energy, ledge annihilation and screw dislocation rotation due to Lothe's forces are discussed. The activation energy for surface cross-slip nucleation when the screw dislocation intersects the free surfaces at right angles, in the absence of ledge annihilation forces, is shown to be 0.05 eV in Ni and 0.09 eV in Cu. The activation-energy values obtained via the nudged elastic band method are significantly lower than the activation energy for cross-slip at attractive forest dislocation intersections in these materials. The present results are expected to be useful in understanding the mechanical behavior of micron-sized pillars under pure tension and compression.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 7, April 2013, Pages 2500-2508
نویسندگان
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