کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1560766 | 1513921 | 2014 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Plastic deformation of a porous bcc metal containing nanometer sized voids
ترجمه فارسی عنوان
تغییر شکل پلاستیک متشکل از متخلخل فلزی حاوی حفره های اندازه نانومتری
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کلمات کلیدی
دینامیک مولکولی، جابجایی، نانوذرات، نانوایی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مکانیک محاسباتی
چکیده انگلیسی
Nanoporous materials, can present an outstanding range of mechanical properties. Both molecular dynamics and dislocation analysis were used to evaluate and quantify the evolution of plasticity in a porous Ta single crystal containing randomly placed voids with 3.3Â nm radii and average initial porosity of 4.1%, when subjected to uniaxial compressive strain. Nanovoids act as effective sources for dislocation emission. Dislocation shear loops nucleate at the surface of the voids and expand by the advance of the edge component. The evolution of dislocation configuration and densities were predicted by the molecular dynamics calculations and successfully compared to an analysis based on Ashby's concept of geometrically-necessary dislocations. Resolved shear stress calculations were performed for all bcc slip systems and used to identify the operating Burgers vectors in the dislocation loops. The temperature excursion during plastic deformation was used to estimate the mobile dislocation density which is found to be less than 10% of the total dislocation density.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 88, 1 June 2014, Pages 92-102
Journal: Computational Materials Science - Volume 88, 1 June 2014, Pages 92-102
نویسندگان
C.J. Ruestes, E.M. Bringa, A. Stukowski, J.F. RodrÃguez Nieva, Y. Tang, M.A. Meyers,