کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9796361 | 1514945 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Continuous dynamic recrystallization in an Al-Li-Mg-Sc alloy during equal-channel angular extrusion
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
An Al-Li-Mg-Sc alloy with an initial grain size of â¼60 μm was processed by equal-channel angular extrusion (ECAE) at 300 °C up to a total strain of 12. Transmission electron microscopy (TEM) and orientation imaging microscopy (OIM) were employed to establish the mechanism of grain refinement. It was found that new ultrafine grains evolved by a strain-induced continuous process, which is termed continuous dynamic recrystallization (CDRX). At É â¼Â 1, a well-defined subgrain structure had developed. Upon further straining the average mis-orientation of deformation-induced boundaries increased; low-angle boundaries (LAB) gradually converted into true high-angle boundaries (â¥15°) (HAB). At É â¼Â 4, arrays of boundaries with low and high angle mis-orientations were observed. At É â¼Â 12, a structure dominated by HAB with an average grain size of â¼0.9 μm was formed. This size is roughly similar to that for subgrains developed at preceding strains. It was shown that CDRX occurs homogeneously; the formation of new grains takes place both along initial boundaries and within interiors of original grains as well.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 396, Issues 1â2, 15 April 2005, Pages 341-351
Journal: Materials Science and Engineering: A - Volume 396, Issues 1â2, 15 April 2005, Pages 341-351
نویسندگان
R. Kaibyshev, K. Shipilova, F. Musin, Y. Motohashi,