کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620233 | 988604 | 2013 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface morphologies due to grooves at moving grain boundaries having stress-driven fluxes
ترجمه فارسی عنوان
مورفولوژی سطحی به علت شیارها در مرزهای دانه متحرک که دارای جریان استرس است
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کلمات کلیدی
حرکت شیار مرز دانه، شار مرز دانه، شیار فشار دادن، فشار،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
We modify a previous steady-state description developed by Gènin [J. Appl. Phys. 77, 5130-5137 (1995)] for a grain boundary groove moving with a prescribed speed in a material subject to in-plane stress and a resultant grain boundary flux. The arbitrary assumption that the grain boundary flux is equally delivered to (or extracted from) the two adjacent free surfaces of the grains is replaced by a condition that requires continuity of surface chemical potentials at the grain boundary. Analytical results for the small-slope approximation as well as nonlinear results for large slopes are computed numerically for steady-state motion at a specified groove speed. We apply these results to a “partial loop” grain boundary geometry that moves by mean curvature induced by the groove conditions. In contrast to the ordinary effect that a grain boundary surface groove retards grain boundary motion, the presence of a compressive stress and resultant grain boundary flux toward the free surface can promote grain boundary motion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 19, November 2013, Pages 7216-7226
Journal: Acta Materialia - Volume 61, Issue 19, November 2013, Pages 7216-7226
نویسندگان
R.F. Sekerka, W.J. Boettinger, G.B. McFadden,