کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5456174 | 1514655 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improved stretch formability of AZ31 sheet via grain size control
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
It is reported that stretch formability of Mg alloys enhances with increasing grain size. In order to understand the effects of grain size, the evolution of microstructure during tensile test was investigated comparing with mechanical properties such as work hardening coefficient n-value) and Lankford value (r-value). An increase in grain size promotes the activation of {10 1Ì
2} tensile twins and most of the tensile twins formed in the grains whose basal poles tilted to the rolling direction (RD) by around 20 degrees during tensile loading toward RD. Promoting tensile twinning contributes to an increase of n-value induced by the interaction between tensile twins and basal dislocations, and a decrease of r-value associated with releasing stress concentration on grain boundaries continuously activating basal dislocation. In the present study, the high formability is associated with tensile twinning up to a certain grain size and then in coarser grain size, it deteriorates by changing the matrix grains into hard orientations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 688, 14 March 2017, Pages 56-61
Journal: Materials Science and Engineering: A - Volume 688, 14 March 2017, Pages 56-61
نویسندگان
Joong Won Park, Kwang Seon Shin,