SYMPOSIA PAPER Published: 01 January 1976
STP29196S

Fractographic Features in Eutectic Composites

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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.

Author Information

Stoloff, NS
Rensselaer Polytechnic Institute, Troy, N.Y.
Duquette, DJ
Rensselaer Polytechnic Institute, Troy, N.Y.
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Details
Developed by Committee: E08
Pages: 154–171
DOI: 10.1520/STP29196S
ISBN-EB: 978-0-8031-4675-4
ISBN-13: 978-0-8031-0360-3