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Lee, Kyong-Whoan,Cho, Gue-Serb,Choe, Kyeong-Hwan,Jo, Hyung-Ho,Ikenaga, Akira,Koroyasu, Sadatoshi The Japan Institute of Metals 2006 MATERIALS TRANSACTIONS Vol.47 No.11
<P>A magnesium alloy was adopted to an evaporative pattern casting (EPC) process to combine advantages of each. In the present study, foam patterns were cast at a top gating system under atmospheric and reduced pressure to evaluate casting characteristics of AZ91D to develop a complete EPC process for high productivity of magnesium alloy castings. Filling time and temperature of molten metal were measured during mold filling. It was recognized that the average filling velocity was affected by the difference of the coating material and the degree of reduced pressure. The grain size of the magnesium alloy was slightly dependent on the degree of reduced pressure. It was considered that the application of the high reduced pressure, which changed the shape of melt surface from convex to concave, was related to the occurrence of internal defects such as cold shut laps or folds in the casting.</P>