کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7881035 | 1509596 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impact of grain boundary character on grain rotation
ترجمه فارسی عنوان
تاثیر شخصیت مرزی دانه بر چرخش دانه
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کلمات کلیدی
مرز دانه، رشد دانه، چرخش دانه، جابجایی، دینامیک مولکولی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
The capillarity-driven shrinkage of isolated cylindrical grains with structurally different grain boundaries in aluminum was studied by molecular dynamics simulations. Three pairs of grains with ã1 0 0ã tilt and mixed tilt-twist boundaries with the misorientation angles θ0 = 5.45°, 16.26° and 22.61° were examined. The simulation results showed that the shrinkage of grains with pure tilt boundaries was accompanied by their rotation towards higher misorientation angles. On the contrary, grains with the mixed boundaries did not rotate significantly during their shrinkage. An analysis revealed that for the observed rotational behavior the grain boundary structure is crucial. In contrast to pure tilt boundaries composed of edge dislocations, for mixed tilt-twist boundaries, which are composed of intersecting dislocations with the mixed edge-screw character, the effective mechanisms of dislocation annihilation are available, which allow the respective grains to shrink without rotation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 80, November 2014, Pages 141-148
Journal: Acta Materialia - Volume 80, November 2014, Pages 141-148
نویسندگان
Luis A. Barrales-Mora, Jann-Erik Brandenburg, Dmitri A. Molodov,