کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7970553 | 1514388 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of deformation micro-mechanisms in nickel consolidated from a bimodal powder by spark plasma sintering
ترجمه فارسی عنوان
بررسی ساختارهای میکرو ماتریس تغییر شکل در نیکل که از یک پودر بیومواد با تجمع پلاسمای جرقه متصل می شوند
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
Bulk polycrystalline nickel compact was processed by spark plasma sintering from heterogeneous powder consisting of a mixture of nanometer and micrometer sized particles. The consolidated samples inherited the bimodal structure of the starting powder and was composed of ~ 55 vol.% coarse-grained (with the grain size larger than 1 μm) and ~ 45 vol.% ultrafine-grained (with an average grain size of ~ 550 nm) components. The deformation mechanisms were established by EBSD, X-ray line profile analysis and in-situ TEM observations. In the ultrafine-grained volume, the deformation occurred mainly through the activation of dislocation sources emitting full or partial dislocation either from grain interior or grain boundaries. Besides dislocation activity, rolling and sliding of nanograins were also observed during deformation by in-situ transmission electron microscopy, which have a considerable contribution to the observed high strain rate sensitivity of the bimodal microstructure. The cracks formed during deformation easily propagated in the nanograin regions due to the weaker particle bonding caused by the relatively high fraction of native oxide layer on the surface of the initial nanoparticles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 99, January 2015, Pages 118-127
Journal: Materials Characterization - Volume 99, January 2015, Pages 118-127
نویسندگان
D. Tingaud, P. Jenei, A. Krawczynska, F. Mompiou, J. Gubicza, G. Dirras,