کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5435945 1509538 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of lattice misfit on plastic deformation behavior of single-crystalline micropillars of Ni-based superalloys
ترجمه فارسی عنوان
اثر ناپیوستگی شبکه بر رفتار تغییر شکل پلاستیک میکرولیاردهای تک کریستالی از ابررسانای بر پایه نیکل
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

The deformation behaviors of rectangular-parallelepiped micropillars fabricated from [001]-oriented Ni-based superalloys with negative and positive lattice misfits, respectively, were investigated with respect to the specimen size. The yield stresses of the larger specimens (side length L > ∼2 μm) of both considered alloy types were found to be nearly independent of the size, while the smaller specimens (L < ∼2 μm) exhibited “smaller is stronger” and “smaller is (slightly) weaker” trends for negative and positive lattice misfits, respectively. The internal stresses calculated based on the micro-elasticity theory revealed that the internal shear stress fields of the micropillars varied with their sizes. The size dependence of the calculated internal shear stress distribution agreed fairly well with the experimentally determined size dependence of the yield stress, indicating that the distribution of the internal misfit stress significantly contributed to the size-dependent yield stress of the smaller micropillars.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 138, 1 October 2017, Pages 119-130
نویسندگان
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