Abstract
The purpose of this study was to improve tensile properties by grain refinement technique for injection molding of magnesium alloy by using solid carbon materials. A solid carbon material of Carbon Black was attached to surface of AZ91D alloy chips by using ball-milling. AZ91D alloy chips and Carbon Black were mixed while heating and stirring in the cylinder of magnesium injection molding machine, then molten metal was injection molded to 2.5 mm thick flat plate. The mechanical characteristics of molded products were evaluated uniaxial tensile load. The tensile test result showed that the 0.2% of proof stress, tensile strength and fracture strain were improved by Carbon Black addition. Microstructure observation revealed that the grain size of molded products were progressively finer when Carbon Black addition was increased. These results suggested that the addition of appropriate amount of Carbon Black is effective to improve the tensile properties of AZ91D alloy.
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