کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1636714 1516954 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Atomic simulation for influence of helium atom on movement of edge dislocation in nickel
ترجمه فارسی عنوان
شبیه سازی اتمی برای تأثیر اتم هلیوم در حرکت ناهنجاری لبه در نیکل
کلمات کلیدی
جنبش، جابجایی لبه، او، شبیه سازی اتمی، نیکل،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
The molecular dynamics (MD) simulation and the modified analytical embedded-atom method (MAEAM) were used to study the influence of a He atom on the movement of the edge dislocation in Ni. First, the calculated Burgers vector distribution shows that the equilibrium dissociation distance (Ded) and the stacking fault energy (Esf) between two partial edge dislocations are about 25.95 Å and 108 mJ/m2, respectively. Then, the obtained formation energies (Ef) of a He atom at some different sites demonstrate that the He atom is attracted and repelled in the tension and compression regions, respectively. And the He-dislocation interaction reveals that an interstitial He atom plays a more significant role in the dislocation movement than a substitutional He atom. Finally, it is found that the movement of an interstitial He atom is apparent as the first partial dislocation bypasses and the edge dislocation offers fast-diffusion path for the migration of a He atom.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 25, Issue 8, August 2015, Pages 2666-2674
نویسندگان
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