کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1505472 993764 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Generalized planner fault energies, twinning and ductility of L12 type Al3Sc and Al3Mg
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Generalized planner fault energies, twinning and ductility of L12 type Al3Sc and Al3Mg
چکیده انگلیسی

The generalized planner fault energy, twinnability, and ductility of both Al3Sc and Al3Mg are studied by first-principles calculations. The results show that a three-layer thick twin may be described as the smallest twin nucleus for both L12 intermetallic compounds Al3Sc and Al3Mg. Because the unstable stacking fault energy (SFE) γus and unstable twin SFE γut of both materials are relatively high, their twin nucleation is very difficult. Meanwhile, both intermetallic compounds exhibit brittle feature because of the low surface energy and high γus. The electronic structure during slipping demonstrates that the electronic density of states and charge density distribution of both intermetallic compounds vary dramatically at the fault layers, and alters the valence–bonding hybridization, so dislocation nucleation would be difficult owing to such large variation of electronic structure deviated from the initial perfect fcc crystal.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Sciences - Volume 13, Issue 1, January 2011, Pages 120–125
نویسندگان
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