شماره ركورد كنفرانس :
4742
عنوان مقاله :
Effect of Precipitation Hardening on Microhardness and Compressive Strength of Air-Casted Dilute Mg-0.4Al-0.6Ca Alloy
پديدآورندگان :
Rafiei Shahabodin S-Rafiei@Semnan.ac.ir Master s student, Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran; , Habibolahzadeh Ali AHabibolahzadeh@Semnan.ac.ir Professor of the Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran;
كليدواژه :
Magnesium alloys , Precipitation hardening , Guinier , Preston zones , Peak , aged , Ca , Al ratio
عنوان كنفرانس :
هفتمين كنفرانس بين المللي مهندسي مواد و متالورژي
چكيده فارسي :
Development of low-cost, rare-earth-free and high-strength magnesium alloys is highly desirable. Reduced quantity of secondary phases in dilute alloys could enhance their ductility. Dilute Mg-0.4Al-0.6Ca (wt.%) alloy with Ca/Al ratio of 1.5 was successfully air casted thanks to minor Calcium addition. The alloy showed a high age hardening response, with an increment of about 36 HV in the peak-aged state. The ultimate compressive strength of as-cast and peak-aged alloys are 243 MPa and 293 MPa, respectively. Microstructural study of alloys by scanning electron microscope and energy-dispersive X-ray spectroscopy shows the formation of Mg17Al12 phase has been suppressed due to high Ca/Al ratio and Mg2Ca is the only present second phase. Microstructural comparison of as-cast, solution-treated and peak-aged alloys do not show any significant difference. This verifies previous studies that attributed the high hardness of peak-aged dilute alloys to the presence of fine plate-like Guinier-Preston (GP) zones on the basal plane.
