STP1157

    Nondestructive Characterization for Metal-Matrix Composite Fabrication

    Published: Jan 1992


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    Abstract

    Nondestructive characterization has been performed on composite products at different stages of fabrication processes including raw powders, powder mixtures, billets, and final product extrusions. Eddy current was found to be effective in identifying matrix powder alloy chemistry and particle size, and in determining the mix ratio of silicon carbide (SiC) reinforcement particles in aluminum matrix alloy powders. Ultrasonic techniques were capable of identifying SiC clusters in large-scale, consolidated powder metallurgy (P/M) metal-matrix composite (MMC) billets, while eddy-current methods could be used to determine near-surface density variations in the billets. Multiple nondestructive evaluation (NDE) techniques (eddy current, ultrasonics, and resistivity) could be employed to quantify microstructural characteristics of composite extrusions. These results indicate that NDE methods can be integrated into manufacturing processes to provide on-line, closed-loop control of fabrication parameters.

    Keywords:

    metal-matrix composites, nondestructive evaluation, aluminum, silicon carbide, ultrasonics, eddy current, resistivity, powders, billets, extrusion, microstructure, intermetallics, fabrication, material processing, powder metallurgy, matrix, density, mixtures, alloy chemistry, particle size, mix ratio, clusters, manufacturing, linear superposition model, ultrasonic velocity, compounds, fatigue (materials), advanced materials


    Author Information:

    Liaw, PK
    Fellow engineer, senior engineer, and manager, Westinghouse Science and Technology Center, Pittsburgh, PA

    Shannon, RE
    Fellow engineer, senior engineer, and manager, Westinghouse Science and Technology Center, Pittsburgh, PA

    Clark, WG
    Fellow engineer, senior engineer, and manager, Westinghouse Science and Technology Center, Pittsburgh, PA

    Harrigan, WC
    General manager, DWA Composite Specialties, Inc., Chatsworth, CA


    Paper ID: STP15352S

    Committee/Subcommittee: E08.09

    DOI: 10.1520/STP15352S


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