کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7881043 1509597 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Atomic core structure and mobility of [1 0 0](0 1 0) and [0 1 0](1 0 0) dislocations in MgSiO3 perovskite
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Atomic core structure and mobility of [1 0 0](0 1 0) and [0 1 0](1 0 0) dislocations in MgSiO3 perovskite
چکیده انگلیسی
The plastic behavior of MgSiO3 perovskite is investigated under pressure conditions similar to those encountered in the Earth's lower mantle. The core structures of dislocations with edge and screw characters are determined by means of atomic-scale simulations for the [1 0 0](0 1 0) and [0 1 0](1 0 0) slip systems. The corresponding Peierls stresses increase monotonously with increasing pressure. The edge [0 1 0](1 0 0) dislocation is found to dissociate by climb and to become sessile at high pressure (P⩾80 GPa). These findings are compared with a continuum Peierls-Nabarro model and with published results in other perovskite materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 79, 15 October 2014, Pages 117-125
نویسندگان
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