Title of article :
Utilization of Microalloying with Rare Earth Elements and Hot Extrusion for Remarkable Grain Refinement and Enhancement of Mechanical Properties of as-Cast Magnesium Alloy
Author/Authors :
Abedi, Hooman School of Metallurgy and Materials Engineering - College of Engineering - University of Tehran - Tehran, Iran , Emamy, Massoud School of Metallurgy and Materials Engineering - College of Engineering - University of Tehran - Tehran, Iran , Mirzadeh, Hamed School of Metallurgy and Materials Engineering - College of Engineering - University of Tehran - Tehran, Iran , Rassizadehghani, Jafar School of Metallurgy and Materials Engineering - College of Engineering - University of Tehran - Tehran, Iran , Ra'ayatpour, M School of Metallurgy and Materials Engineering - College of Engineering - University of Tehran - Tehran, Iran
Pages :
6
From page :
29
To page :
34
Abstract :
The effects of micro-addition by rare earth (RE) elements (via cerium-based mischmetal) and hot deformation (via extrusion process) on the microstructure and mechanical properties of Mg-0.5Zn-0.5Zr alloy were studied. Optical microscopy, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and tensile testing were used for characterization of alloys in the as-cast and wrought conditions. It was found that the addition of 0.5 wt% RE combined with the hot extrusion process could remarkably refine the grain size from 1320 μm for the as-cast Mg-0.5Zn-0.5Zr alloy to the recrystallized grain size of 1.3 μm for the extruded Mg-0.5Zn-0.5Zr-0.5RE alloy. Compared to the as-cast counterparts, the ultimate tensile strength (UTS) and total elongation to failure were significantly enhanced by the extrusion process. Quantitatively, the UTS of ~ 300 MPa with the total elongation of ~ 18% was obtained for the extruded Mg-0.5Zn-0.5Zr-0.5RE alloy, which reveals the favorable effects of the ultra grain refinement on the enhancement of the mechanical properties of magnesium alloys.
Keywords :
Mg alloys , Ultrafine grained , microstructure , Recrystallization , Mechanical properties
Journal title :
Journal of Advanced Materials and Processing
Serial Year :
2020
Record number :
2630423
Link To Document :
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