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A friction effect in low-load hardness testing of copper and aluminium

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Abstract

Vickers hardness tests were conducted on samples of copper and aluminium in a cold rolled or annealed condition to determine the apparent hardness variation in the load range 15 g to 20 kg. The variation was greatest for the soft specimens. Lubrication with an extreme-pressure lubricant was effective in reducing the hardness values to a virtually constant level for each metal. It is therefore reaffirmed that the hardness variation is attributable to friction and that strain hardening propensity is important in governing the magnitude of the variation. Comparison of these findings with data previously reported for similar tests on iron suggests that the phenomenon is probably an indentation size effect.

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References

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, The University of Wollongong, PO Box 1144, 2500, Wollongong, New South Wales, Australia

    H. Shi & M. Atkinson

Authors
  1. H. Shi
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  2. M. Atkinson
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Shi, H., Atkinson, M. A friction effect in low-load hardness testing of copper and aluminium. J Mater Sci 25, 2111–2114 (1990). https://doi.org/10.1007/BF01045774

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  • DOI: https://doi.org/10.1007/BF01045774

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