Abstract
Prestretch deformation of 6.48% with various initial speeds (1 mm/min, 101 mm/min, and 100 mm/min) was carried out at 723 K to improve the formability of AZ31 Mg alloy sheet. After prestretching, the (0001) basal texture weakened with increase in the speed owing to activation of nonbasal slips during deformation, while the yield strength and anisotropy decreased simultaneously. Owing to the basal texture weakening, the Schmid factors of the basal slips and strain-hardening coefficient increased, while the Lankford value decreased, enhancing the stretch formability of the AZ31 Mg alloy sheet. In addition, the Erichsen value was improved from 2.48 mm for the as-received alloy to 4.36 mm for the sample prestretched at 100 mm/min (an enhancement of 75.8%). This may provide a new approach for industrial production of Mg alloy sheets with weakened basal texture and improved formability by applying a smaller prestrain at higher temperature.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (51704209, U1810208), Advanced Programs of Department of Human Resources and Social Security of Shanxi Province for Returned Scholars Scientific (2017014), and Technological Innovation Programs of Higher Education Institutions in Shanxi (201802034), The Projects of International Cooperation in Shanxi (201803D421086). The authors also thank Dr. Lyu Jinlong, who helped to modify the structure and language of this paper.
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Wang, L., Zhang, Z., Cao, M. et al. Enhanced Stretch Formability of Magnesium Alloy Sheet by Prestretching at Various Speeds at Higher Temperature. JOM 71, 1705–1713 (2019). https://doi.org/10.1007/s11837-019-03392-0
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DOI: https://doi.org/10.1007/s11837-019-03392-0