발간논문

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Vol.29, No.2, 112 ~ 119, 1991
Title
Effects of Eutectic Si Particles on mechanical Properties and Fracture Process of Cast A356.O Al - SiC Composites
김영환Young Hwan Kim, 이성학Sung Hak Lee, 김낙준Nack J . Kim, 이두영Doo Young Lee
Abstract
In this study an attempt has been made to improve mechanical properties of a cast aluminum matrix composite. Detailed microstructural analyses of a cast A356.0 Al-SiC composite indicated that SiC particulates and eutectic Si particles were segregated to the intercellular regions. The presence of these eutectic Si particles resulted in cleavage fracture along the intercellular regions, which deteriorated mechanical properties of the cast composite. In-situ SEM fracture observations clearly showed that eutectic Si particles were cracked first before the matrix-SiC decohesion or the SiC breakage occurred. In order to modify the distribution of eutectic Si particles the cast composite was re-cast with adding small amount of Sr. Tensile properties of the re-cast composite with 0.03wt.% Sr were significantly improved. The improvement of mechanical properties is attributed to a more homogeneous distribution of SiC and eutectic Si particles due to the addition of Sr and recasting.
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