کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1576272 | 1514772 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Molecular dynamics simulations of rate-dependent grain growth during the surface indentation of nanocrystalline nickel
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Molecular dynamics simulations are leveraged in this study to explore rate-dependent grain growth and deformation in nanocrystalline nickel due to surface indentation at room temperature. A 50Â nm thin film with approximately 700 grains is indented with a 15Â nm spherical indenter at rates of 0.2Â m/s, 1.0Â m/s, and 5.0Â m/s. We simulate the indentation, hold, and removal of the indenter, as well as compute grain growth and distribution profiles during microstructure deformation. Novel algorithms are also developed in this work to accurately distinguish individual grains and provide quantitative data for the evolution of the microstructure. Results of the simulations show that lattice deformation mechanisms, such as dislocation slip and twinning, that accompany grain growth are also functions of indentation rate and equilibration time. This work shows that grain growth in this nanocrystalline nickel structure is indeed rate-dependent, and is most prominent for grains near the indentation surface during both the hold and removal of the indenter.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 571, 1 June 2013, Pages 207-214
Journal: Materials Science and Engineering: A - Volume 571, 1 June 2013, Pages 207-214
نویسندگان
Garritt J. Tucker, Stephen M. Foiles,