Influence of rolling temperature on static recrystallization behavior of AZ31 magnesium alloy |
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Authors: | Xinsheng Huang Kazutaka Suzuki Yasumasa Chino Mamoru Mabuchi |
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Affiliation: | 1. Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi, 463-8560, Japan 2. Graduate School of Energy Science, Kyoto University, Kyoto, 606-8501, Japan
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Abstract: | Poor formability of rolled magnesium (Mg) alloys extremely restricts applications in form of sheets originating from formation
of strong basal texture. Recently, we found that increasing rolling temperature from 723 to 798 K for a AZ31 Mg alloy can
significantly improve stretch formability due to remarkable texture weakening after annealing. In this study, static recrystallization
behaviors of AZ31 alloy sheets rolled at 723 and 798 K were investigated by electron backscattered diffraction analyses at
different annealing stages in order to understand the origin of high temperature rolling on texture weakening. For both sheets,
similar deformation microstructures with approximately the same types and fractions of twins exist in the as-rolled condition
and recrystallized grains are mainly formed at pre-existing grain boundaries due to discontinuous recrystallization during
subsequent annealing. However, only the basal texture of the latter remarkably weakens due to the formation of new recrystallized
grains with well-dispersed orientations. Non-basal slips enhanced during high temperature rolling at 798 K are most likely
responsible for the texture randomization as a result of rotations of recrystallization nuclei. |
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