INVESTIGATION OF MECHANICAL PROPERTIES OF AZ91D MAGNESIUM ALLOY BY GRAVITY DIE CASTING PROCESS
Keywords:Magnesium alloys, Gravity die casting, Mechanical properties, porosity fraction.
AbstractIn this study, the die casting materials particularly AZ91D is selected to know the mechanical properties by gravity die casting process at 680,710,740 and 780Â°C pouring temperatures. The mould is designed especially for Magnesium alloys and its temperature is maintained at 650Â°C for all casting process. The tensile specimens were obtained from the as cast sample and the mechanical properties were measured. The percentage, % of porosity is measured at different spots with respect to the ingate. The results shown that the lower pouring temperature results higher strength for Magnesium alloy (AZ91D). Further the highest percentage, % of porosity is obtained in the areas nearer to raiser and lower percentage, % of porosity is obtained nearer to the ingate. The highest tensile strength, yield strength, percentage, % of elongation, hardness and less percentage, % of porosity is obtained for the specimens taken nearer to the ingate which is the starting point of melt entry in to cavity. The effect of the porosity towards the mechanical properties was analyzed and discussed.
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