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Thermal Response on the Microstructure and Texture of ECAP and Cold-Rolled Pure Magnesium

Abstract : This paper deals with dynamic recrystallization (DRX), static recrystallization, and grain growth phenomena of pure magnesium after equal channel angular pressing (ECAP) by route A and BC at 523 K (250 °C) followed by 80 pct cold rolling. The ECAP-deformed and the subsequently rolled samples were annealed at 373 K and 773 K (100 °C and 500 °C). The associated changes in the microstructure and texture were studied using electron back-scattered diffraction. ECAP produced an average grain size of ~12 to 18 µm with B and C2 fiber textures. Subsequent rolling led to an average grain size ~8 to 10 µm with basal texture fiber parallel to ND. There was no noticeable increase in the average grain size on annealing at 373 K (100 °C). However, significant increase in the average grain size occurred at 773 K (500 °C). The occurrence of different DRX mechanisms was detected: discontinuous dynamic recrystallization was attributed to basal slip activity and continuous dynamic recovery and recrystallization to prismatic/pyramidal slip systems. Only continuous static recrystallization could be observed on annealing.
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Somjeet Biswas, D. Satyaveer Singh, Benoît Beausir, Laszlo S. Toth, Satyam Suwas. Thermal Response on the Microstructure and Texture of ECAP and Cold-Rolled Pure Magnesium. Metallurgical and Materials Transactions A, Springer Verlag/ASM International, 2015, 46 (6), pp.2598 - 2613. ⟨10.1007/s11661-015-2846-z⟩. ⟨hal-01515439⟩



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