Numerical analysis of effects of inhomogeneous matrix microstructures on deformation characteristics in aluminum matrix composites

Hiroyuki Toda, Toshiro Kobayashi, Naoya Inoue

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Recently it has been reported that PFZ layers, ranging several ten and 100 nm in thickness, and coarse interfacial equilibrium 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. 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. 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. Interphase having intermediate Young's modulus remarkably improves the strength of the MMCs.

Original languageEnglish
Pages (from-to)120-127
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume61
Issue number2
DOIs
Publication statusPublished - Jan 1 1997

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Aluminum
numerical analysis
Numerical analysis
Precipitates
precipitates
aluminum
microstructure
Microstructure
composite materials
Composite materials
matrices
plastic flow
reinforcement
Plastic flow
voids
modulus of elasticity
Reinforcement
plastics
Elastic moduli
axial stress

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "Recently it has been reported that PFZ layers, ranging several ten and 100 nm in thickness, and coarse interfacial equilibrium 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. 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. 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. Interphase having intermediate Young's modulus remarkably improves the strength of the MMCs.",
author = "Hiroyuki Toda and Toshiro Kobayashi and Naoya Inoue",
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AU - Kobayashi, Toshiro

AU - Inoue, Naoya

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AB - Recently it has been reported that PFZ layers, ranging several ten and 100 nm in thickness, and coarse interfacial equilibrium 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. 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. 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. Interphase having intermediate Young's modulus remarkably improves the strength of the MMCs.

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