کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7977297 | 1514701 | 2015 | 40 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of nanometric inclusions on the microstructural characteristics and strengthening of a friction-stir processed aluminum-magnesium alloy
ترجمه فارسی عنوان
اثرات ترکیبات نانومتری بر ویژگی های ریزساختاری و تقویت آلومینیوم منیزیم آلومینیوم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
An aluminum-magnesium alloy was friction-stir processed in the presence of TiO2 nanoparticles which were pre-placed in a groove on the surface to produce a composite. Field emission-scanning and transmission electron microscopy studies show that solid state chemical reactions occur between the Al-Mg matrix and the ceramic particles upon the severe plastic deformation process. The microstructure of the aluminum alloy consists of a coarse grain structure, large complex (Fe,Mn,Cr)3SiAl12 particles, and small Mg2Si precipitates. After friction stir processing, a deformed grain structure containing rod-like Al-Fe-Mn-Si precipitates is attained, along with cuboidal (~100Â nm) Cr2 precipitates and spherical (~100 and 5Â nm) Mg2Si particles. In the presence of TiO2 nanoparticles, magnesium oxide (MgO) and titanium aluminide (Al3Ti) nanophases are formed. It is shown that these microstructural modifications lead to a significant enhancement in the hardness and tensile strength of the aluminum alloy. The relationship between the microstructural evolution and mechanical properties and the role of hard inclusions are presented and discussed. An analysis based on strengthening models indicates that the yield strength of the nanocomposite is mainly controlled by dislocations and grain boundaries rather than the nano-scale inclusions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 642, 26 August 2015, Pages 215-229
Journal: Materials Science and Engineering: A - Volume 642, 26 August 2015, Pages 215-229
نویسندگان
F. Khodabakhshi, A. Simchi, A.H. Kokabi, P. Å vec, F. SimanÄÃk, A.P. Gerlich,