Utilization of Microalloying with Rare Earth Elements and Hot Extrusion for Remarkable Grain Refinement and Enhancement of Mechanical Properties of as-Cast Magnesium Alloy
- سال انتشار: 1399
- محل انتشار: فصلنامه مواد پیشرفته و فرآوری، دوره: 8، شماره: 4
- کد COI اختصاصی: JR_JMATPR-8-4_003
- زبان مقاله: انگلیسی
- تعداد مشاهده: 164
نویسندگان
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box ۱۱۱۵۵-۴۵۶۳, Tehran, Iran
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box ۱۱۱۵۵-۴۵۶۳, Tehran, Iran
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box ۱۱۱۵۵-۴۵۶۳, Tehran, Iran
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box ۱۱۱۵۵-۴۵۶۳, Tehran, Iran
School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box ۱۱۱۵۵-۴۵۶۳, Tehran, Iran
چکیده
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-۰.۵Zn-۰.۵Zr 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 ۰.۵ wt% RE combined with the hot extrusion process could remarkably refine the grain size from ۱۳۲۰ µm for the as-cast Mg-۰.۵Zn-۰.۵Zr alloy to the recrystallized grain size of ۱.۳ µm for the extruded Mg-۰.۵Zn-۰.۵Zr-۰.۵RE 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 ~ ۳۰۰ MPa with the total elongation of ~ ۱۸% was obtained for the extruded Mg-۰.۵Zn-۰.۵Zr-۰.۵RE alloy, which reveals the favorable effects of the ultra grain refinement on the enhancement of the mechanical properties of magnesium alloys.کلیدواژه ها
Mg alloys, Ultrafine grained microstructure, Recrystallization, Mechanical Propertiesاطلاعات بیشتر در مورد COI
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