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Plastic instability in amorphous selenium near its glass transition temperature

Published online by Cambridge University Press:  31 January 2011

Caijun Su,
James A. LaManna,
Yanfei Gao,
Warren C. Oliver and
George M. Pharr
James A. LaManna*
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
Yanfei Gao*
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996; and Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Warren C. Oliver
Affiliation:
Nanomechanics Inc., Oak Ridge, Tennessee 37830
George M. Pharr
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996; and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
*
a)Present address: Alliant Techsystems Inc., Elkton, MD 21921.
b)Address all correspondence to this author. e-mail: ygao7@utk.edu
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Abstract

The deformation behavior of amorphous selenium near its glass transition temperature (31 °C) has been investigated by uniaxial compression and nanoindentation creep tests. Cylindrical specimens compressed at high temperatures and low strain rates deform stably into barrel-like shapes, while tests at low temperatures and high strain rates lead to fragmentation. These results agree well with stress exponent and kinetic activation parameters extracted from nanoindentation creep tests using a similarity analysis. The dependence of the deformation modes on temperature and strain rate can be understood as a consequence of material instability and strain localization in rate-dependent solids.

Keywords

NanoindentationHardnessAmorphous

Information

Type
Materials Communications
Information
Journal of Materials Research , Volume 25 , Issue 6 , June 2010, pp. 1015 - 1019
Copyright
Copyright © Materials Research Society 2010

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References

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