抄録
The purpose of this study is to improve the bending strength of Mg alloy by adding the solid carbon. The solid carbon (Carbon Black) was coated with surface of the chip of Mg alloy (AZ91D ) before molding by using ball mill. AZ91D and Carbon Black were mixed while heating and stirring in the barrel of the molding machine, then molten metal was injected to the mold. The mechanical characteristics of molded specimen was evaluated under three point bending load to investigate the effects of the addition of Carbon Black to its bending properties. Test results showed that the 10% of improvement in the bending strength was obtained when the 0.3 wt% of Carbon Black was added. However, when 0.5wt% of Carbon Black was added, bending strength and fracture strain were decreased. Microstructure observation revealed that the addition of Carbon Black was effective to the grain refinement of AZ91D. However, the aggregate of carbon was confirmed when 0.5wt% of Carbon Black was added. This paper cleared that the appropriate amount addition of Carbon Black was effective to improve the bending strength of AZ91D.
