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Grain-boundary hardening and elastic recovery of micro-indentations

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Abstract

Variation in micro-hardness across a grain boundary, a well-documented effect found in many materials, is here confirmed for zone-refined iron containing 170 at. ppm of tin. Elastic recovery of the impression-diagonal was practically negligible but considerable recovery occurred in the direction of the indentation penetration depth. The latter is different for impressions located at grain boundaries compared with those located at grain interiors, when small loads are applied; however, this difference diminishes with increasing load. Excess hardening at grain boundaries also decreases as the load increases. The results are discussed in terms of the elastic-plastic properties of the material sampled by the impression, and evaluations of some of the parameters are presented. The correlation between grain-boundary hardening and elastic recovery of the impressions is also indicated.

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Authors and Affiliations

  1. Hydro-Quebec Institute of Research, Varennes, Quebec, Canada

    M. Braunović

  2. Department of Metallurgy, University of Sheffield, England

    C. W. Haworth

Authors
  1. M. Braunović
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  2. C. W. Haworth
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Braunović, M., Haworth, C.W. Grain-boundary hardening and elastic recovery of micro-indentations. J Mater Sci 7, 763–770 (1972). https://doi.org/10.1007/BF00549904

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  • DOI: https://doi.org/10.1007/BF00549904

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