The correlation of indentation size effect experiments with pyramidal and spherical indenters

J.G. Swadener; E.P. George; G.M. Pharr

doi:10.1557/PROC-695-L11.5.1

The correlation of indentation size effect experiments with pyramidal and spherical indenters

J.G. Swadener, E.P. George, G.M. Pharr

Research output: Contribution to journal › Article › peer-review

Abstract

Experiments were conducted in annealed iridium using pyramidal and spherical indenters over a wide range of load. For a Berkovich pyramidal indenter, the hardness increased with decreasing depth of penetration. However, for spherical indenters, hardness increased with decreasing sphere radius. Based on the number of geometrically necessary dislocations generated during indentation, a theory that takes into account the work hardening differences between pyramidal and spherical indenters is developed to correlate the indentation size effects measured with the two indenters. The experimental results verify the theoretical correlation.

Original language	English
Pages (from-to)	451-456
Number of pages	6
Journal	Materials Research Society Symposium Proceedings
Volume	695
DOIs	https://doi.org/10.1557/PROC-695-L11.5.1
Publication status	Published - 2001

Bibliographical note

Los Alamos National Laboratory, an affirmative action/equal opportunity employer, is operated by the University of California for the U.S. Department of
Energy under contract W-7405-ENG-36. By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royaltyfree
license to publish or reproduce the published form of this contribution, or to allow others to do so, for U.S. Government purposes. Los Alamos National
Laboratory requests that the publisher identify this article as work performed under the auspices of the U.S. Department of Energy. Los Alamos National Laboratory
strongly supports academic freedom and a researcher's right to publish; as an institution, however, the Laboratory does not endorse the
viewpoint of a publication or guarantee its technical correctness.

Keywords

annealed iridium
pyramidal indenters
spherical indenters
Iridium alloys
Indentation
Indentation size effect

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10.1557/PROC-695-L11.5.1

The Correlation of Indentation Size Effect Experiments with Pyramidal and Spherical Indenters
Los Alamos National Laboratory, an affirmative action/equal opportunity employer, is operated by the University of California for the U.S. Department of Energy under contract W-7405-ENG-36. By acceptance of this article, the publisher recognizes that the U.S. Government retains a nonexclusive, royaltyfree license to publish or reproduce the published form of this contribution, or to allow others to do so, for U.S. Government purposes. Los Alamos National Laboratory requests that the publisher identify this article as work performed under the auspices of the U.S. Department of Energy. Los Alamos National Laboratory strongly supports academic freedom and a researcher's right to publish; as an institution, however, the Laboratory does not endorse the viewpoint of a publication or guarantee its technical correctness.
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Cite this

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title = "The correlation of indentation size effect experiments with pyramidal and spherical indenters",

abstract = "Experiments were conducted in annealed iridium using pyramidal and spherical indenters over a wide range of load. For a Berkovich pyramidal indenter, the hardness increased with decreasing depth of penetration. However, for spherical indenters, hardness increased with decreasing sphere radius. Based on the number of geometrically necessary dislocations generated during indentation, a theory that takes into account the work hardening differences between pyramidal and spherical indenters is developed to correlate the indentation size effects measured with the two indenters. The experimental results verify the theoretical correlation.",

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N2 - Experiments were conducted in annealed iridium using pyramidal and spherical indenters over a wide range of load. For a Berkovich pyramidal indenter, the hardness increased with decreasing depth of penetration. However, for spherical indenters, hardness increased with decreasing sphere radius. Based on the number of geometrically necessary dislocations generated during indentation, a theory that takes into account the work hardening differences between pyramidal and spherical indenters is developed to correlate the indentation size effects measured with the two indenters. The experimental results verify the theoretical correlation.

AB - Experiments were conducted in annealed iridium using pyramidal and spherical indenters over a wide range of load. For a Berkovich pyramidal indenter, the hardness increased with decreasing depth of penetration. However, for spherical indenters, hardness increased with decreasing sphere radius. Based on the number of geometrically necessary dislocations generated during indentation, a theory that takes into account the work hardening differences between pyramidal and spherical indenters is developed to correlate the indentation size effects measured with the two indenters. The experimental results verify the theoretical correlation.

KW - annealed iridium

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KW - spherical indenters

KW - Iridium alloys

KW - Indentation

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The correlation of indentation size effect experiments with pyramidal and spherical indenters

Abstract

Bibliographical note

Keywords

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