کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620238 | 988604 | 2013 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New experimental insight into the mechanisms of nanoplasticity
ترجمه فارسی عنوان
تجربی جدید به مکانیزم نانو پلاستیسیته
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کلمات کلیدی
نانو پلاستیک چرخش فشار بالا، ریز ساختار، بافت، مکانیزم تغییر شکل
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
The evolution of microstructure and texture of a nanocrystalline Pd-10Â at.% Au alloy (initial grain size 16Â nm) subjected to severe plastic deformation by high-pressure torsion (HPT) at room temperature is investigated by X-ray line profile analysis and X-ray microdiffraction, respectively. In addition, changes in the microhardness are measured and the texture is modeled. During HPT the microstructure changes: the crystallite size goes over the maximum, the dislocation density goes through a minimum and the density of stacking faults decreases at/up to a shear strain of â¼1, corresponding to a grain size of 20Â nm. Starting with a random texture, typical brass-type shear components develop at a shear strain above â¼1. The microhardness with decreasing crystallite size goes over a maximum at â¼20Â nm. The correlated changes in microstructure, texture and strength strongly suggest the transition from a dislocation slip to a grain boundary sliding (GBS)-dominated deformation mechanism. The unexpected brass-type texture and its deviation from the ideal position can be simulated with the Taylor model assuming dominant partial dislocation slip and a certain contribution of GBS, respectively. Taken together, the results of many techniques applied to the same material, in particular those of the texture investigations, provide a more comprehensive and consistent picture of nanoplasticity than reported before for face-centered cubic metals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 19, November 2013, Pages 7271-7284
Journal: Acta Materialia - Volume 61, Issue 19, November 2013, Pages 7271-7284
نویسندگان
W. Skrotzki, A. Eschke, B. Jóni, T. Ungár, L.S. Tóth, Yu. Ivanisenko, L. Kurmanaeva,