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Dynamic strain aging and serrated flow in MnO

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Abstract

The effects of aging on the upper yield stress τup and serrated flow have been studied in MnO single crystals at 900 °C for oxygen partial pressures ρO 2 of 10−11 and 10−7 Pa. Aging initially increases τup as a consequence of segregation of aliovalent impurities to dislocations for both ρO 2 values. For long aging times and ρO 2 = 10-11 Pa, serrated flow accompanied by solute softening is observed. The data fit predictions of a Portevin-Le Chatelier model for serrations, but with impurity atmospheres causing softening instead of hardening. This is believed to result from changes in local defect equilibria caused by segregation of impurities with valences greater than two to dislocations.

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Authors and Affiliations

  1. Materials Science and Technology Division, Argonne National Laboratory, Argonne, Illinois, 60439, USA

    K. C. Goretta & J. L. Routbort

  2. Department of Metallurgical and Materials Engineering, Illinois Institute of Technology, Chicago, Illinois, 60616, USA

    T. A. Bloom

Authors
  1. K. C. Goretta
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  2. J. L. Routbort
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  3. T. A. Bloom
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Goretta, K.C., Routbort, J.L. & Bloom, T.A. Dynamic strain aging and serrated flow in MnO. Journal of Materials Research 1, 124–129 (1986). https://doi.org/10.1557/JMR.1986.0124

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  • DOI: https://doi.org/10.1557/JMR.1986.0124

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