کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1575139 | 1514734 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Incipient plasticity and dislocation nucleation in body-centered cubic chromium
ترجمه فارسی عنوان
ابتلا به پوسیدگی و خنثی سازی جابجایی در کروم مکعبی محور
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کلمات کلیدی
تعهد، هسته زدگی، نانو انداختن،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
In this study, we conducted nanoindentation tests to explore the incipient plasticity (or onset of yielding) in a fully annealed coarse-grained Cr at loading rates between 0.02 and 2 mN/s and temperatures ranging from 295 to 423 K. The maximum shear stress at the first indentation pop-in were evaluated and found comparable to the theoretical shear strength for the yielding of dislocation-free Cr. The activation volume and activation energy for the onset of yielding were also evaluated using Schuh׳s statistical model, and further compared with that anticipated for homogeneous and heterogeneous dislocation nucleation processes. We concluded that heterogeneous nucleation was the favorite mechanism and the type of point defect that induced dislocation nucleation appeared to be interstitials rather than vacancies in the body-centered cubic Cr.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 609, 15 July 2014, Pages 110-115
Journal: Materials Science and Engineering: A - Volume 609, 15 July 2014, Pages 110-115
نویسندگان
D. Wu, T.G. Nieh,