Fractographic Features in Eutectic Composites

    Published: Jan 1976

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    An extensive literature has emerged on the flow and fracture behavior of aligned eutectic composites. However, there have been few attempts to systematically record and compare fractographic features in eutectics as a function of microstructural variables (for example, interfiber spacing) or test conditions (for example, temperature, load application). This paper constitutes a compilation and evaluation of fractographic features from specimens loaded parallel to the eutectic growth direction, obtained by scanning and transmission electron microscopy from the following fibrous alloys: Al-Al3Ni, Ni,Cr-TaC, and Co,Cr,Ni-TaC; and lamellar alloys: Ag3Mg-AgMg, Mg17Al12-Mg, and Al-Ag2Al. Tensile, creep, and fatigue loading at a variety of test temperatures are included for several of these alloys. It will be shown that fatigue fracture morphology is particularly sensitive to microstructural variables. For example, a shift from striation-free Stage I cracking to profusely-striated Stage II cracking in Ag3Mg-AgMg is obtained by post-solidification heat treatment.


    fatigue (materials), composite materials, crack propagation, crack initiation, creep properties, eutectics, frequencies, solidification, striations

    Author Information:

    Stoloff, NS
    Professor and associate professor, Rensselaer Polytechnic Institute, Troy, N.Y.

    Duquette, DJ
    Professor and associate professor, Rensselaer Polytechnic Institute, Troy, N.Y.

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP29196S

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