کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5456314 | 1514659 | 2017 | 29 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of volume fraction and dispersion of icosahedral phase particles on the strength and work hardening of Mg-Zn-Y alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The cast microstructure of a Mg-13Zn-1.55Y alloy (ZW132) with a high volume fraction of I-phase (7.4%) was refined considerably by severe plastic deformation via high-ratio differential speed rolling (HRDSR). Ultrafine grains (0.7-1.3 µm) with high angle boundary fractions of 0.48-0.50 were obtained after HRDSR with speed ratios of 2 or 3. The alloy processed at a speed ratio of 3 exhibited high strength and high ductility, with a yield stress of 332 MPa and a tensile elongation of 16.3%. The ductility of the rolled ZW alloy was controlled by the work hardening rate, which increased as the amount of I-phase, the degree of refinement of the eutectic I-phase pockets, the degree of dispersion of the broken I-phase particles over the matrix, and the size of the resultant grains increased. A model that considers the contribution of these factors to the work hardening rate was proposed. Grain-size reduction was found to be a major strengthening mechanism. Dispersion of the I-phase particles broken from the eutectic I-phase pockets did not contribute significantly to the material's strength.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 684, 27 January 2017, Pages 284-291
Journal: Materials Science and Engineering: A - Volume 684, 27 January 2017, Pages 284-291
نویسندگان
T.Y. Kwak, W.J. Kim,