抄録
In this study, as a novel centrifugal mixed-powder method, reaction centrifugal mixed-powder method was applied for Mg–Si system to fabricate Mg/Mg2Si functionally graded materials (FGMs). In advance, the mixed powder of Mg and Si particles is inserted into a rotationable mold, and then the molten Mg is poured into the mold with the powder mixture. As a result, the molten metal matrix penetrated into the space between the particles due to the pressure exerted by the centrifugal force. At the same time, Mg particles were melted by the heat from the molten Mg, and it allowed the occurrence of Mg/Si reaction. Using this method, Mg/Mg2Si FGMs with gradual distribution of Mg2Si particles was successfully fabricated. Particles size and morphology of Mg2Si particles in the FGMs depend on the amount of Si particles in mixed powder. This is because the reaction heat due to the reaction of Si particles and molten Mg is influenced by the amount of Si particles. Therefore, it can be concluded that the reaction heat is important factor for the reaction centrifugal mixed-powder method, and it controls the microstructure of the FGMs.
