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The Effect of Icosahedral Phase on Dynamic Recrystallization Evolution and Hot Workability of Mg-2.0Zn-0.3Zr-0.2Y Alloy

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Abstract

The effect of Icosahedral phase (I-phase) on hot deformation behavior, dynamic recrystallization (DRX) evolution, and hot workability of Mg-2.0Zn-0.3Zr-0.2Y alloy has been investigated in the temperature range of 300-500 °C and strain rate range of 0.001-1 s−1 using Gleeble 3500D thermo-mechanical simulator. Based on regression analysis for Arrhenius-type equation of flow behavior, the average activation energy of deformation was determined as Q = 277.8 kJ/mol. The model of DRX evolution is \( \mathop X\nolimits_{\text{DRX}} = 1 - \exp [ - 1.8082(\frac{{\upvarepsilon - \upvarepsilon_{c} }}{{\upvarepsilon^{*} }})^{1.7904} ] \). The DRX model agreed well with the microstructure evolution of the alloy at all deformation conditions. At lower strain rates (0.001-0.01 s−1), continuous DRX (CDRX) is the main DRX mechanism that occurred near the original grain boundaries. Twin-dynamic recrystallization (TDRX) began to occur at lower deformation temperatures and higher strain rates (0.1-1 s−1). At a deformation temperature range of 250 to 350 °C and a strain rate of 1 s−1, the main DRX mechanism is TDRX, and the density of twins decreased, and CDRX began to occur near the original grain boundaries. When the deformation temperature increased to 400 °C, TDRX disappeared and CDRX occurred near original grain boundaries and I-phase particles. According to the flow stress behavior and DRX model, the processing maps have exhibited the optimum deformation conditions to be 450 °C and the strain rate range of 0.01-0.001 s−1.

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Acknowledgment

This work was funded by the National Science & Technology Support Program (Project No.2011BAE22B03-3) and International Science & Technology Cooperation Program of China (Project No.2011DFA5090-5).

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Authors and Affiliations

  1. College of Mechanical Engineering, Qingdao Technological University, Qingdao, 266520, China

    Bin-Jiang Lv & Zhong Chu

  2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Bin-Jiang Lv & Jian Peng

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Lv, BJ., Peng, J. & Chu, Z. The Effect of Icosahedral Phase on Dynamic Recrystallization Evolution and Hot Workability of Mg-2.0Zn-0.3Zr-0.2Y Alloy. J. of Materi Eng and Perform 24, 3502–3512 (2015). https://doi.org/10.1007/s11665-015-1604-0

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  • DOI: https://doi.org/10.1007/s11665-015-1604-0

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