کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620290 | 988605 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Room temperature equal-channel angular pressing of a magnesium alloy
ترجمه فارسی عنوان
فشار دادن یک اتاق از یک آلیاژ منیزیم برابر با کانال اتاق
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
Equal-channel angular pressing (ECAP) of magnesium alloy Mg-3Al-1Zn (wt.%) has been carried out at room temperature by applying a back-pressure three times larger than the yield stress in a 90° die. In a single pass, the initial grain size of â¼10 μm originating from twin-roll casting was reduced down to â¼3 μm. {101¯2} tensile twins were observed by orientation imaging up to â¼40% volume fraction in grains that remained relatively high after ECAP. Regions with small grain size did not show twinning. The small lattice curvatures indicated that dynamic recovery/recrystallization took place during testing. The 90° ECAP deformation field was approximated by two-stage simple shear due to a large dead metal zone appearing at the outer corner of the die. Using this strain path, the viscoplastic self-consistent (VPSC) model was employed to model the texture evolution in the version where a parameter (α) tunes the interaction equation between a grain and the homogeneous equivalent medium. The textures were reproduced in good accord with experiments only if the α parameter corresponded to the Tangent VPSC model. Twinning was simulated in a quantitative way by introducing the volume transfer scheme in the VPSC model without employing a criterion for selection of the six possible twin variants.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 8, May 2013, Pages 3027-3036
Journal: Acta Materialia - Volume 61, Issue 8, May 2013, Pages 3027-3036
نویسندگان
C.F. Gu, L.S. Tóth, D.P. Field, J.J. Fundenberger, Y.D. Zhang,