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Investigation of thermally activated deformation in amorphous PMMA and Zr-Cu-Al bulk metallic glasses with broadband nanoindentation creep

Published online by Cambridge University Press:  31 January 2011

J.B. Puthoff
Affiliation:
Materials Science Program, University of Wisconsin–Madison, Madison, Wisconsin 53706
J.E. Jakes
Affiliation:
Materials Science Program, University of Wisconsin–Madison, Madison, Wisconsin 53706; and USDA Forest Product Laboratory, Madison, Wisconsin 53726
H. Cao
Affiliation:
Materials Science Program, University of Wisconsin–Madison, Madison, Wisconsin 53706
D.S. Stone*
Affiliation:
Materials Science Program, University of Wisconsin–Madison, Madison, Wisconsin 53706; and Materials Science and Engineering, University of Wisconsin–Madison, Madison, Wisconsin 53706
*
a) Address all correspondence to this author. email: [email protected]
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Abstract

The development of nanoindentation test systems with high data collection speeds has made possible a novel type of indentation creep test: broadband nanoindentation creep (BNC). Using the high density of data points generated and analysis techniques that can model the instantaneous projected indent area at all times during a constant-load indentation experiment, BNC can reveal materials properties across a range of strain rates spanning up to five decades (10−4–10 s−1). BNC experiments aimed at measuring activation parameters for plasticity were conducted on three systems: two Zr-based bulk metallic glasses and poly-(methyl methacrylate) (PMMA). The results give insight into the operation of the deformation mechanisms present in the test materials, including the dependence of the deformation rate on the hydrostatic component of the stress for PMMA and the form of the activation energy function for the metallic glasses.

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Articles
Copyright
Copyright © Materials Research Society 2009

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References

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