발간논문

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Vol.35, No.11, 1529 ~ 1540, 1997
Title
Alloy design of Thixoformable Wrought SiC / Al Alloy Composites
이재철 , 변지영 , 오창석 , 이인호 Jae Chul Lee , Ji Young Byun , Chang Seok Oh , Ho In Lee
Abstract
One of the major issues in fabricating the Al alloy composites reinforced with SiC particulates is to avoid interfacial reaction products, i.e., Al₄C₃ and Si. The formation of such interfacial reaction products can be supressed by the presence of adequate amount of Si within the matrix of the composite. Equilibrium Si contents required to prevent the interfacial reaction in various SiCp/wrought Al composite were predicted both using theoretical calculations and experimental method. According to the results, equilibrium Si contents increased with increasing temperature ; When the composite is exposed at temperatures below the solidus of the matrix, less than 1 at.% of Si was found out to be enough for preventing the interfacial reaction. However, Si contents required to prevent the interfacial reaction was observed to increase substantially at temperatures near 600℃ such that more: than 5 at% of Si was required to prohibit the interfacial reaction even at 620℃. Application of such results for designing the matrix alloy and selecting process parameters for the semi-solid forming was demonstrated.
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