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Ultrafine grained Mg-Zn-Zr magnesium alloy via microalloying with rare earth elements and hot extrusion
Paper ID : 1003-UFGNSM2021-FULL
Oral / Poster Presentation File
Authors:
Hooman Abedi *, Hamed Mirzadeh, Massoud Emamy, Jafar Rassizadehghani, Mohammadbaqer Ra'ayatpour
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
Abstract:
Grain refinement and enhancement of the tensile properties of Mg-Zn-Zr alloy via addition of rare earth (RE) elements at microalloying levels and utilization of hot extrusion process were investigated. The extrusion of the RE-containing Mg-Zn-Zr alloy replaced the coarse grain size of the as-cast ingot with an ultrafine grained (UFG) microstructure with the recrystallized grain size of ~ 1 µm. In this regard, the effect of the RE elements during solidification and the occurrence of the dynamic recrystallization (DRX) during hot extrusion process were found to be responsible. Accordingly, the ultimate tensile strength (UTS) and total elongation were significantly enhanced, which reveals the synergistic effect of RE addition and hot extrusion process on the enhancement of the mechanical properties of magnesium alloys.
Keywords:
Magnesium alloys, Recrystallization, Grain refinement, Mechanical properties
Status : Paper Published