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Dislocations produced in magnesium oxide crystals due to contact pressures developed by softer cones

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Abstract

An experimental investigation shows that dislocations, encompassing a predictable dislocated volume, are produced in MgO single crystals subjected to circular contact pressures due to cones of other solids which may be an order of magnitude softer. The mean contact pressure necessary to produce localized plastic flow, without fracture, is shown to be directly related to the critical resolved shear stress of the MgO. Dislocation etching is used to investigate the influence of cone hardness and normal loading on the nature of the deformed zone in the harder crystal and the results are discussed in terms of the deformation characteristics of the softer cones and the crystal.

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Authors and Affiliations

  1. Department of Materials Engineering, University of Cape Town, 7700, Rondebosch, South Africa

    M. P. Shaw

  2. Department of Engineering Design and Manufacture, University of Hull, HU6 7RX, Hull, UK

    C. A. Brookes

Authors
  1. M. P. Shaw
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  2. C. A. Brookes
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Shaw, M.P., Brookes, C.A. Dislocations produced in magnesium oxide crystals due to contact pressures developed by softer cones. J Mater Sci 24, 2727–2734 (1989). https://doi.org/10.1007/BF02385617

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  • DOI: https://doi.org/10.1007/BF02385617

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