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    Use of the Indentation Size Effect on Microhardness for Materials Characterization

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    This paper describes several different physicochemical mechanisms that produce an indentation size effect on microhardness. The mechanisms are illustrated with reference to published data. A simple quantitative model for surface layer effects is presented, and its relevance to chemomechanical effects on ceramics is discussed.

    A well-behaved empirical function describing some indentation size effects is introduced, and its advantages are discussed. It is used in a new method of graphically presenting microhardness data which is presented here for the first time. This “error-ellipsoid” diagram not only is visually compact and statistically rigorous but is based on a new physically meaningful parameter, the “10-μm hardness.”


    hardness, indentation, microhardness, microindentation, surface layers, surface plasticity, chemomechanical effects, indentation size effect (ISE), Meyer index, microindentation hardness testing

    Author Information:

    Sargent, PM
    Research assistant, University of Cambridge, Cambridge,

    Committee/Subcommittee: E04.05

    DOI: 10.1520/STP32956S