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
Autor: | Bin-Jiang Lv, Ning Cui, Che Qinglun, Guo Feng, Xu Yang, Yuan-Lin Guan |
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Rok vydání: | 2018 |
Předmět: |
010302 applied physics
Recrystallization (geology) Materials science Mechanical Engineering Alloy Thermodynamics 02 engineering and technology engineering.material Strain rate 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Mechanics of Materials Contour line 0103 physical sciences engineering Dynamic recrystallization General Materials Science Deformation (engineering) 0210 nano-technology Crystal twinning |
Zdroj: | Journal of Materials Engineering and Performance. 27:3773-3782 |
ISSN: | 1544-1024 1059-9495 |
Popis: | 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. |
Databáze: | OpenAIRE |
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