Numerical Analysis of Effects of Inhomogeneous Matrix Microstructures on Deformation Characteristics in Aluminum Matrix Composites

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  • Toda Hiroyuki
    Department of Production Systems Engineering, Toyohashi University of Technology
  • Kobayashi Toshiro
    Department of Production Systems Engineering, Toyohashi University of Technology
  • Inoue Naoya
    Department of Production Systems Engineering, Toyohashi University of Technology

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  • アルミニウム合金基複合材料の変形特性に及ぼすマトリクス不均質ミクロ組織の影響の数値解析
  • アルミニウム ゴウキンキ フクゴウ ザイリョウ ノ ヘンケイ トクセイ ニ オ

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Abstract

Recently it has been reported that PFZ layers, ranging several ten and 100 nm in thickness, and coarse interfacial equiribrium precipitates were formed around reinforcements, and that solute atoms were simultaneously segregated toward the interface. In this study, SiC whisker-reinforced 6061 Aluminum alloys are adopted as model materials. Effects of such locally-inhomogeneous microstructures of a matrix on the deformation and fracture characteristics of the MMCs are analyzed by means of the elastic-plastic finite element analysis.<BR>Due to the ductile nature of the PFZ layers, the concentrated plastic flow within the PFZ layers increases the effective plastic strain in the whole matrix, thereby reducing the strength of the MMCs. On the other hand, the interfacial precipitates effectively retard the concentrated plastic flow within the PFZ layers and consequently suppress the reduction in strength due to the formation of the PFZ. However, the interfacial precipitates never exhibit such preferable influence when the matrix is homogeneous.<BR>Both the axial stress within the whiskers and the initiation rate of voids due to the strain concentration around edges of the whiskers increase with extension of the PFZ layers and the interfacial precipitates. The initiation rate of the void is remarkably affected by the morphology and density of the precipitates. Since both the shear stress at the precipitate-reinforcement interface and the internal stresses within the precipitates are considerably high, the properties of the precipitates except for Young’s modulus are important.<BR>Interphase having intermediate Young’s modulus remarkably improves the strength of the MMCs.

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