Abstract
It is known that magnesium alloys can be rolled up to a large thickness reduction and develop a unique texture when the rolling speed is high (>1000 m/min). In order to understand the texture formation mechanism during high-strain-rate deformation, high-speed rolling of AZ31 magnesium alloy samples having different initial textures was conducted. The main components of the textures after the rolling were the RD-split basal, which consisted of 10°-20° inclining basal poles from the normal direction toward the rolling direction of the sheet, regardless of the different initial textures. With preheating at 473 K, all the samples were rolled without cracking while all were cracked when preheating was not applied. The optical micrographs and EBSD measurements showed a significant amount of twins and the cracks that developed along the shear bands consisted with laminated twins. Based on the texture simulation using the visco-plastic self-consistent model, it is concluded that the rapid development of the RD-split basal component from the initial basal alignment along the transverse direction was attributable to the tension twinning, \(\{10\bar{1}2\}\) \(\langle \bar{1}011\rangle .\) The effect of the initial texture on the crack formation can be explained by the activation of the twinning system.
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Acknowledgments
The authors would like to acknowledge Mr. Miyamoto, Osaka University, for helping with the high-speed rolling experiment. We thank Mr. Asgari and Mr. Ouellet for valuable discussion and providing language help. We also thank Professor Tomé for providing the code of VPSC-7. The project was supported by Auto21, Canadian Network of Centers of Excellence.
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Onuki, Y., Hara, K., Utsunomiya, H. et al. High-Speed Rolling of AZ31 Magnesium Alloy Having Different Initial Textures. J. of Materi Eng and Perform 24, 972–985 (2015). https://doi.org/10.1007/s11665-014-1318-8
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DOI: https://doi.org/10.1007/s11665-014-1318-8