کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1569868 1514269 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interaction of helium atoms with edge dislocations in α-Fe
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Interaction of helium atoms with edge dislocations in α-Fe
چکیده انگلیسی

Formation energies, binding energies, and migration energies of interstitial He atoms in and near the core of an a/2〈1 1 1〉{1 1 0} edge dislocation in α-Fe are determined in atomistic simulations using conjugate gradient relaxation and the Dimer method for determining saddle point energies. Results are compared as a function of the proximity of the He to the dislocation core and the excess interstitial volume in regions around the dislocation. Interstitial He atoms have negative binding energy on the compression side of the dislocation and strong positive binding energy on the tension side. Even at low temperatures, interstitial He atoms in the vicinity of the dislocation easily migrate to the dislocation core, where they form crowdion interstitials oriented along the close-packed slip direction, with binding energies in excess of 2 eV. Crowdion interstitial He atoms diffuse along the dislocation core, transverse to the crowdion direction, with a migration energy of 0.4–0.5 eV.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 351, Issues 1–3, 1 June 2006, Pages 141–148
نویسندگان
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