کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1581889 | 1514865 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Flow stresses and activation volumes for highly deformed nanoposts
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Recent interest in high-strength nanocrystalline structures has prompted a call for understanding scale effects in deformation mechanisms. One aspect, producing nanostructures by severe plastic deformation, promoted the present examination of nanoposts undergoing large strain compression. On e-beam lithography produced nanoposts of both aluminum and permalloy with radii ranging from 50 to 150Â nm, single and repeat compression tests produced measurements of flow stress and apparent activation volume. Flow stresses, continuously measured with a nanoindenter allowed theoretical assessment of the deformation mechanism. It was concluded that the high stresses (1-3Â GPa) and small activation volumes (1-10b3) where b is the modulus of the Burgers vector, were consistent with dislocation nucleation. A traditional model is shown to give good first order accountability for these two face-centered cubic metals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 493, Issues 1â2, 15 October 2008, Pages 12-20
Journal: Materials Science and Engineering: A - Volume 493, Issues 1â2, 15 October 2008, Pages 12-20
نویسندگان
W.M. Mook, M.S. Lund, C. Leighton, W.W. Gerberich,