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Low-Cycle fatigue of dispersion-strengthened copper

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Abstract

The cyclic deformation behavior of a dispersion-strengthened copper alloy, GlidCop Al-15, has been studied at plastic strain amplitudes in the range 0.1 pct ≤Δε p/2 ≤ 0.8 pct. Compared to pure polycrystalline copper, the dispersion-strengthened material exhibits a relatively stable cyclic response as a consequence of the dislocation substructures inherited from prior processing and stabilized by the A12O3 particles. These dislocation structures remain largely unaltered during the course of deformation; hence, they do not reveal any of the features classically associated with copper tested in fatigue. At low amplitudes, the fatigue lifetimes of the dispersion-strengthened copper and the base alloy are similar; however, the former is more susceptible to cracking at stress concentrations because of its substantially greater strength. This similarity in fatigue lifetimes is a consequence of the dispersal of both deformation and damage accumulation by the fine grain size and dislocation/particle interactions in the GlidCop alloy. The operation of these mechanisms is reflected in the fine surface slip markings and rough fracture surface features for this material.

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Authors and Affiliations

  1. Clorox Company, Pleasanton, CA, 94556

    J. Robles (Packaging Engineer)

  2. Division of Materials Science and Engineering, Department of Chemical Engineering and Materials Science, University of California, 95616, Davis, CA

    K. R. Anderson (Graduate Research Assistant), J. R. Groza (Associate Professor) & J. C. Gibeling (Associate Professor)

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  1. J. Robles
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  2. K. R. Anderson
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  3. J. R. Groza
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  4. J. C. Gibeling
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Formerly Graduate Research Assistant, University of California, Davis, CA

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Robles, J., Anderson, K.R., Groza, J.R. et al. Low-Cycle fatigue of dispersion-strengthened copper. Metall Mater Trans A 25, 2235–2245 (1994). https://doi.org/10.1007/BF02652324

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  • DOI: https://doi.org/10.1007/BF02652324

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