کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7975740 | 1514689 | 2016 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Molecular dynamics simulation study of deformation mechanisms in 3C-SiC during nanometric cutting at elevated temperatures
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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 (MD) simulation was employed in this study to elucidate the dislocation/amorphization-based plasticity mechanisms in single crystal 3C-SiC during nanometric cutting on different crystallographic orientations across a range of cutting temperatures, 300Â K to 3000Â K, using two sorts of interatomic potentials namely analytical bond order potential (ABOP) and Tersoff potential. Of particular interesting finding while cutting the (110)<001Ì
> was the formation and subsequent annihilation of stacking fault-couple and Lomer-Cottrell (L-C) lock at high temperatures, i.e. 2000Â K and 3000Â K, and generation of the cross-junctions between pairs of counter stacking faults meditated by the gliding of Shockley partials at 3000Â K. Another point of interest was the directional dependency of the mode of nanoscale plasticity, i.e. while dislocation nucleation and stacking fault formation were observed to be dominant during cutting the (110)<001Ì
>, low defect activity was witnessed for the (010)<100> and (111)<1Ì
10> crystal setups. Nonetheless, the initial response of 3C-SiC substrate was found to be solid-state amorphization for all the studied cases. Further analysis through virtual X-ray diffraction (XRD) and radial distribution function (RDF) showed the crystal quality and structural changes of the substrate during nanometric cutting. A key observation was that the von Mises stress to cause yielding was reduced by 49% on the (110) crystal plane at 3000Â K compared to what it took to cut at 300Â K. The simulation results were supplemented by additional calculations of mechanical properties, generalized stacking faults energy (GSFE) surfaces and ideal shear stresses for the two main slip systems of 3C-SiC given by the employed interatomic potentials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 654, 27 January 2016, Pages 400-417
Journal: Materials Science and Engineering: A - Volume 654, 27 January 2016, Pages 400-417
نویسندگان
Saeed Zare Chavoshi, Xichun Luo,