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Vol.36, No.2, 242 ~ 249, 1998
Title
The Effect of Infiltration Temperature and Time on Al-Mg / SiC Composites Fabricated by Pressureless Infiltration Method
이건배 , 이경원 , 허성우 , 한관희 , 권훈 K . B . Lee , K . W . Lee , S . W . Heo , K . H . Han , H . Kwon
Abstract
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.
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