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무가압 침투법에 의해 제조된 Al-Mg/SiC 복합재료에 미치는 침투온도 및 시간의 영향
이경원,권훈,이건배,한관희,허성우 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.2
The effects of infiltration temperature and time on the infiltration behavior of molten metal, tensile properties and interfacial reaction in Al-3wt%Mg/SiC_p composite fabricated by pressureless infiltration method were investigated. It is believed that spontaneous infiltration of molten metal is related to the formation of Mg₃N₂ by the reaction of Mg and nitrogen. The addition of Mg to the powder mixture bed made the infiltration occur even at a low temperature of 700℃. Tensile and y field strengths and elongation tended to decrease with increasing infiltration temperature and time, due to enhancement of interfacial reaction. Both Al₄C₃ and Si were formed as a result of the interfacial reaction between Al alloy melt and SiC particulates. The Si rejected into the matrix which combined with the Mg in the matrix during aging after solution treatment led to the age hardening.