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Mechanisms Underlying Hardness Numbers

Published online by Cambridge University Press:  01 February 2011

John J. Gilman
John J. Gilman*
Affiliation:
Materials Science and Engineering, University of California at Los Angeles, Los Angeles, CA 90095
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Abstract

Relationships of indentation hardness numbers to to other physical properties are demonstrated. They differ depending on the type of chemical bonding; metals, alloys ionic, covalent, and metal-metalloid. The properties are: shear modulus; ionic charge; band-gap density; polarizability; and formation energy, respectively. In each case the rationale is provided. The concept of a “bonding Modulus” is introduced. It is concluded that the conventional wisdom that hardness is a purely empirical property does not hold. Phase transformations and indentation hardness are connected broadly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T6.11/R10.11
Copyright
Copyright © Materials Research Society 2005

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References

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