Fatigue in SiC-particulate-reinforced aluminium alloy composites

Shinji Kumai*, Julia E. King, John F. Knott

*Corresponding author for this work

    Research output: Contribution to journalArticle

    Abstract

    The fatigue behaviour in SiC-particulate-reinforced aluminium alloy composites has been briefly reviewed. The improved fatigue life reported in stress-controlled test results from the higher stiffness of the composites; therefore it is generally inferior to monolithic alloys at a constant strain level. The role of SiC particulate reinforcement has been examined for fatigue crack initiation, short-crack growth and long-crack growth. Crack initiation is observed to occur at matrix-SiC interface in cast composites and either at or near the matrix-SiC interface or at cracked SiC particles in powder metallurgy processed composites depending on particle size and morphology. The da/dN vs ΔK relationship in the composites is characterized by crack growth rates existing within a narrow range of ΔK and this is because of the lower fracture toughness and relatively high threshold values in composites compared with those in monolithic alloys. An enhanced Paris region slope attributed to the monotonic fracture contribution are reported and the extent of this contribution is found to depend on particle size. The effects of the aging condition on crack growth rates and particle size dependence of threshold values are also treated in this paper. © 1991.

    Original languageEnglish
    Pages (from-to)317-326
    Number of pages10
    JournalMaterials Science and Engineering A
    Volume146
    Issue number1-2
    DOIs
    Publication statusPublished - 25 Oct 1991

    Keywords

    • aluminum and alloys
    • fatigue composite materials
    • interfaces composite materials
    • interfaces metals and alloys
    • applications silicon carbide
    • carbide particulate reinforcement
    • crack initiation
    • fatigue crack surfaces
    • fatigue lLife
    • crack propagation

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