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Plastic Zone Development Around Nanoindentations

Published online by Cambridge University Press:  17 March 2011

C. L. Woodcock ,
D. F. Bahr  and
N. R. Moody
C. L. Woodcock
Affiliation:
Mechanical and Materials Engineering, Washington State University, Pullman, WA
D. F. Bahr
Affiliation:
Mechanical and Materials Engineering, Washington State University, Pullman, WA
N. R. Moody
Affiliation:
Mechanical and Materials Engineering, Washington State University, Pullman, WA Sandia National Laboratories, Livermore, CA
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Abstract

Johnson's cavity model relating indenter geometry and deformation resulting from elastic-plastic indentations is appropriate for a wide variety of materials. In the case of nanoindentations in single crystal BCC metals, limitations are reached when creep is not fully accounted for. Both the standard Berkovich and cube corner geometries show that the ratio of plastic zone radius to contact radius increases with the duration of time at the peak load. Indenter tip geometry is shown to play an important role in this phenomenon. Length scale phenomena, such as the indentation size effect, are also subject to various interpretations. The traditional definition of hardness does not produce similar trends with indentation length scale between the blunt Berkovich geometry and the sharper cube corner tip. However, the ratio of plastic zone radius to contact radius proves to be a tip geometry independent method of assessing the plasticity of these metals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q7.14
Copyright
Copyright © Materials Research Society 2001

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References

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