کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5016754 | 1465577 | 2017 | 47 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Grain boundary sliding, triple junction disclinations and strain hardening in ultrafine-grained and nanocrystalline metals
ترجمه فارسی عنوان
کشش مرزی دانه، کشش اتصال سه گانه و سخت شدن کششی در فلزات فوق سنگین و نانوکریستال
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کلمات کلیدی
مرز دانه شکل پذیری، ساز و کارهای تقویت، مواد پلی کریستالی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
A theoretical model is suggested which describes grain boundary (GB) sliding and its accommodation through dislocation slip in ultrafine-grained and nanocrystalline metals. The initial stage of the accommodating dislocation slip represents emission of lattice dislocations from triple junctions into grain interiors. The lattice dislocations emitted from a triple junction slip across a grain and are absorbed by an opposite GB where they are dissociated into GB dislocations that climb along the GB. In the situation where these GB sliding and accommodating processes are dominant, stress-strain dependences are calculated in ultrafine-grained copper. With the calculated dependences, we found that pronounced strain hardening occurs which is related to the accommodation processes and associated formation of disclinations at triple junctions of GBs. It is theoretically revealed that the special (new) strain hardening mechanism under discussion can play a significant role in enhancing ductility of ultrafine-grained and nanocrystalline metals at comparatively low temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 96, September 2017, Pages 227-241
Journal: International Journal of Plasticity - Volume 96, September 2017, Pages 227-241
نویسندگان
I.A. Ovid'ko, A.G. Sheinerman,