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.
|Number of pages||6|
|Journal||Materials Research Society Symposium Proceedings|
|Publication status||Published - 2001|
Bibliographical noteLos 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.
- annealed iridium
- pyramidal indenters
- spherical indenters
- Iridium alloys
- Indentation size effect