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Characterization of Shape Memory and Superelastic Effects by Instrumented Indentation Experiments

Published online by Cambridge University Press:  11 February 2011

Wangyang Ni ,
Yang-Tse Cheng  and
David S. Grummon
Wangyang Ni
Affiliation:
Materials and Processes Laboratory, General Motors Research and Development Center, Warren, MI 48090, USA Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA
Yang-Tse Cheng
Affiliation:
Materials and Processes Laboratory, General Motors Research and Development Center, Warren, MI 48090, USA
David S. Grummon
Affiliation:
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA
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Abstract

The shape memory and superelastic effects of martensitic and austenitic NiTi alloys were studied by instrumented indentation experiments. The shape memory effect was quantitatively characterized by the thermo-activated depth recovery ratio of the residual indentation depth. The superelasticity of austenitic NiTi was quantitatively characterized by the depth and work recovery ratios obtained from the load-displacement curves. The shape memory and superelastic effects under different indenters (Berkovich, Vickers, and spherical) and loads were rationalized using the concept of the representative strain and maximum strain. This study demonstrates that instrumented indentation techniques are useful in the quantitative characterization of the shape memory and superelastic effects in micro- and nano-meter length scale.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 750: Symposium Y – Surface Engineering 2002–Synthesis, Characterization and Applications , 2002 , Y1.4
Copyright
Copyright © Materials Research Society 2003

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References

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