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Effect of Gd on Dynamic Recrystallization Behavior of Magnesium During Hot Compression
Mohammad Hossein Barezban,Reza Roumina,Hamed Mirzadeh,Reza Mahmudi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
Dynamic recrystallization (DRX) behavior of two binary Mg–0.5Gd and Mg–1.5Gd alloys and pure Mg were studied by hotcompression in the temperature range of 300–450 °C to explore the role of Gd on DRX grain size refinement and kinetics.The dependency of DRX grain size on the Gd content during hot compression was quantified and expressed based on theZener–Hollomon parameter. While the exponent of the Zener–Hollomon parameter was obtained as − 0.118 independentof the Gd content, the proportionality constant varied by Gd concentration. The developed expression revealed significantreduction in the DRX grain size of the Mg–Gd alloys. The volume fraction of dynamically recrystallized grains was calculatedby applying the Johnson–Mehl–Avrami–Kolmogorov type model, which resolved the faster kinetics for DRX of the Mg–1.5Gd alloy compared to ones for the Mg–0.5Gd alloy and pure Mg. The higher driving pressure for DRX of the Mg–1.5Gdalloy was justified based on dislocation density measurements at the onset of DRX through the Williamson-Hall method.