کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1575283 | 1514742 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of bulk bimodal polycrystalline nickel deformed by direct impact loadings
ترجمه فارسی عنوان
مشخصه نیکل پلی کریستالیک دوغاب فله ای با تغییرات بارهای تاثیر مستقیم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
Spark plasma sintering of a blend of powders with nanometer and micrometer sized particles yielded to a composite-like nickel microstructure consisting of ultrafine-grained (UFG) and coarse-grained (CG) volumes with the fractions of 36% and 64%, respectively. Microstructure evolution and nanohardness distributions of specimens submitted to impact loading at various velocities between 12 and 50Â msâ1 were determined. At a velocity of 12Â msâ1, cracks were formed in the UFG regions but they were stopped by the CG entities. Higher velocities resulted in crack-free microstructures and considerable grain fragmentation within CG regions. X-ray line profile analysis investigations showed a decrease of mean crystallite size from ~104 (initial state) to ~41Â nm (highest velocity). The dislocation density first increased up to 20Â msâ1 then it decreased considerably with increasing impact velocity, indicating recovery in the microstructure due to the conversion of plastic work into heat. Accordingly, the average nanohardness decreased with increasing the velocity from 20 to 31Â msâ1. No difference between the microstructures impacted at 31 and 50Â msâ1 was observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 601, 17 April 2014, Pages 48-57
Journal: Materials Science and Engineering: A - Volume 601, 17 April 2014, Pages 48-57
نویسندگان
G. Dirras, D. Tingaud, G. Csiszár, J. Gubicza, H. Couque, F. Mompiou,