کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1447262 988640 2011 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Twinning and grain subdivision during dynamic deformation of a Mg AZ31 sheet alloy at room temperature
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Twinning and grain subdivision during dynamic deformation of a Mg AZ31 sheet alloy at room temperature
چکیده انگلیسی

The microstructural evolution of an AZ31 rolled sheet during dynamic deformation at strain rates of ∼103 s−1 has been investigated by electron backscatter diffraction, X-ray and neutron diffraction. The influence of orientation on the predominant deformation mechanisms and on the recovery processes taking place during deformation has been systematically examined. The results have been compared with those corresponding to the same alloy tested quasi-statically under equivalent conditions. It has been found that strain rate enhances the activation of {101¯2} extension twinning dramatically, while contraction and secondary twinning are not significantly influenced. The polarity of {101¯2} extension twinning is even reversed in some grains under selected testing conditions. Significant grain subdivision by the formation of geometrically necessary boundaries (GNBs) takes place during both quasi-static and dynamic deformation of this AZ31 alloy. It is remarkable that GNBs of high misorientations form even at the highest strain rates. The phenomenon of recovery has been found to be orientation dependent.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 59, Issue 18, October 2011, Pages 6949–6962
نویسندگان
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