Journal of Materials Science

, Volume 31, Issue 12, pp 3109–3114 | Cite as

Determination of the hardness and elastic modulus from continuous vickers indentation testing

  • J. Gubicza
  • A. Juhász
  • P. Tasnádi
  • P. Arató
  • G. Vörös
Article

Abstract

Continuous Vickers (Hv) indentation tests were performed on different materials (ion crystals, metals, ceramics, silica glass and plastic). Load-indentation depth curves were taken during the loading as well as during the unloading period by a computer controlled hydraulic mechanical testing machine (MTS 810). The indentation work measured both the loading and the unloading periods, and these were used for the evaluation of parameters characterizing the materials. It was found empirically that there were linear connections between the maximum load to the power 3/2 and the indentation work. These connections were used to relate the conventional hardness number, Hv, and Young's modulus, E, with the work performed during loading and unloading. This work can be determined with great accuracy from the measurements. The values of the Young's modulus and the Vickers hardness determined this way agree well with those obtained by conventional methods. On the basis of continuous indentation tests, materials can be easily classified into the isomechanical groups introduced by Ashby. For this classification the Hv/E ratio is generally used. As a substitute for Hv/E another parameter is recommended which can be determined easily from a single measurement.

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References

  1. 1.
    F.Fröhlich, P.Grau and W.Grellmann, Phys. Status Solidi (a) 42 (1977) 79.Google Scholar
  2. 2.
    W. C.Oliver and G. M.Pharr, J. Mater. Res. 7 (1992) 1564.Google Scholar
  3. 3.
    J. L.Loubet, J. M.Georges, O.Marchesini and G.Meille, J. Tribology 106 (1984) 43.Google Scholar
  4. 4.
    M.Sakai, Acta Metall Mater. 41 (1993) 1751.Google Scholar
  5. 5.
    A.Juhász, G.Vörös, P.Tasnádi, I.Kovács, I.Somogyi and J.Szöllösi, Colloque C7, supplément au J. de Physique III, 3 (1993) 1485.Google Scholar
  6. 6.
    A.Juhász, M.Dimitrova-Lukács, G.Vörös, J.Gubicza, P.Tasnádi, P.Lukács and A.Kele, Fortchrittsberichte der Deutschen Keramischen Gesellschaft 9 (1994) 87.Google Scholar
  7. 7.
    S. S.Chiang, D. B.Marshall and A. G.Evans, J. Appl. Phys. 53 (1982) 298.Google Scholar
  8. 8.
    K. L.Johnson, J. Mech. Phys. Solids 18 (1970) 115.CrossRefGoogle Scholar
  9. 9.
    D.Tabor, Rev. Phys. Technol. 1 (1970) 145.Google Scholar
  10. 10.
    Idem, “Hardness of Metals” (Clarendon Press, Oxford, 1951).Google Scholar
  11. 11.
    I. N.Sneddon, Int. J. Engng Sci. 3 (1965) 47.Google Scholar
  12. 12.
    G. M.Pharr, W. C.Oliver and F. R.Brotzen, J. Mater. Res. 7 (1992) 613.Google Scholar
  13. 13.
    B. R.Lawn and V. R.Howes, J. Mater. Sci. 16 (1981) 2745.Google Scholar
  14. 14.
    A. E. H.Love, Q. F. Math. 10 (1939) 161.Google Scholar
  15. 15.
    M. F.Ashby and A. M.Brown, in Proceedings of the Second Riso International Symposium on Metallurgy and Materials Science, edited by N.Hansen et al., Riso National Laboratory (Roskilde, Denmark, 1981) p. 1.Google Scholar

Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • J. Gubicza
    • 1
  • A. Juhász
    • 1
  • P. Tasnádi
    • 1
  • P. Arató
    • 1
    • 2
  • G. Vörös
    • 1
  1. 1.Department of General PhysicsEötvös University, BudapestBudapestHungary
  2. 2.Research Institute for Technical PhysicsBudapestHungary

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