Abstract
The variation of apparent hardness observed in previously reported Vickers indentation tests of metals is reexamined. Common deseriptions of the effect are shown to be inaccurate: the variation of apparent hardness is monotonic but not simple. The effect is consistent with varying size of a previously postulated “plastic hinge” at the perimeter of the indent. This complexity confers uncertainty on the estimation of characteristic macrohardness from small scale tests. Association of the indentation size effect with friction and with strain hardening is confirmed.
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References
B. W. Mott, Micro-indentation Hardness Testing (Butterworths, London, 1956).
H. Buckle, Metall. Rev. 4, 49 (1959).
T. Yoshino, Bull. Jpn. S. M. E. 8, 291 (1965).
Discussion to Ref. 10: J. Testing and Evaluation 20, 475–476 (1992).
W. C. Oliver and G. M. Pharr, J. Mater. Res. 7, 1564 (1992).
T. J. Bell, J. S. Field, and M. V. Swain, Mater. Forum 17, 127 (1993).
N. Gane and J. M. Cox, Philos. Mag. 19, 881 (1970).
D. Tate, Trans. Am. Soc. Met. 35, 374 (1945).
E. O. Bernhardt, Z. Metallk. 33, 135 (1941).
F. Froehlich, P. Grau, and W. Grellmann, Phys. Status Solidi A 42, 79 (1977).
G. H. Frischat, in Strength of Inorganic Glasses (Plenum Press, New York, 1986).
M. Atkinson, J. Testing and Evaluation 19, 368 (1991).
M. Atkinson, Mater. Sci. Eng. A (1995, in press).
M. Atkinson and H. Shi, Mater. Sci. Technol. 5, 613 (1989).
H. Shi and M. Atkinson, J. Mater. Sci. 25, 2111 (1990).
M. Atkinson, Int. J. Mech. Sci. 33, 843 (1991).
L. E. Samuels, in Microindentation Techniques in Materials Science and Engineering, ASTM STP 889, edited by Blau and Lawn (1986), pp. 5–25.
W. Mason, P. F. Johnson, and J. R. Varner, J. Mater. Sci. 26, 6576 (1991).
M. Atkinson, J. Mater. Sci. 30, 1728 (1995).
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Atkinson, M. Further analysis of the size effect in indentation hardness tests of some metals. Journal of Materials Research 10, 2908–2915 (1995). https://doi.org/10.1557/JMR.1995.2908
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DOI: https://doi.org/10.1557/JMR.1995.2908