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A New Method for Optimizing Hot Processing Parameters of Mg-6.0Zn-0.5Mn-0.5Er Alloy Based on Kinetic Model of Dynamic Recrystallization and Processing Map

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Abstract

Hot deformation behavior of the cast-homogenized Mg-6.0Zn-0.5Mn-0.5Er alloy was studied using dynamic recrystallization (DRX) kinetic model and processing map. The compressing tests were conducted in the temperature range of 250-450 °C and strain rates of 0.001-1 s−1. According to the evolution of microstructures, under lower strain rates, the main DRX mechanism of Mg-6.0Zn-0.5Mn-0.5Er alloy is continuous DRX (CDRX); twinning induced DRX (TDRX) and CDRX both become the main DRX mechanism under higher strain rates. The DRX kinetics model of Mg-6.0Zn-0.5Mn-0.5Er alloy is calculated as \(X_{\text{DRX}} = 1 - \exp \left[ { - 1.9463\left( {\frac{{\varepsilon - \varepsilon_{\text{c}} }}{{\varepsilon^{*} }}} \right)^{1.4608} } \right]\), which is corresponding to the microstructure evolutions of DRX under different deformation conditions. The contour map of DRX was proposed based on the calculation results of DRX kinetics model. The processing maps are constructed to predict processing parameters of the alloy, and the predictability was evaluated combining with the contour map of DRX and dynamic materials model (DMM) processing map. It is deduced from the microstructures evolution and processing map that the optimum processing domain is mainly at 380-450 °C and 0.01-0.001 s−1, and 410-420 °C and 0.01-1 s−1.

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Acknowledgments

This research was financially supported by Natural Science Foundation of Shandong Province, China (Project No. ZR2016EMQ08), Chinese Postdoctoral Science Foundation (Project No. 2017M612224) and Shandong Province Higher Education Science and Technology Program, China (Project Nos. J16LB06, J17KA055).

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

    Bin-Jiang Lv, Feng Guo, Qing-Lun Che, Yang Xu, Ning Cui & Yuan-Lin Guan

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  1. Bin-Jiang Lv
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  2. Feng Guo
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Correspondence to Bin-Jiang Lv or Feng Guo.

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Lv, BJ., Guo, F., Che, QL. et al. A New Method for Optimizing Hot Processing Parameters of Mg-6.0Zn-0.5Mn-0.5Er Alloy Based on Kinetic Model of Dynamic Recrystallization and Processing Map. J. of Materi Eng and Perform 27, 3773–3782 (2018). https://doi.org/10.1007/s11665-018-3443-2

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