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A Theory of Shape-Memory Thin Films with Applications

Published online by Cambridge University Press:  10 February 2011

K. Bhattacharya  and
R. D. James
K. Bhattacharya
Affiliation:
Division of Engineering and Applied Science, 104–44 California Institute of Technology, Pasadena CA 91125, USA; bhatta@cco.caltech.edu
R. D. James
Affiliation:
Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN 55455, USA; james@aem.umn.edu
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Shape-memory alloys have the largest energy output per unit volume per cycle of known actuator systems [1]. Unfortunately, they are temperature activated and hence, their frequency is limited in bulk specimens. However, this is overcome in thin films; and hence shape-memory alloys are ideal actuator materials in micromachines[l]. The heart of the shape-memory effect lies in a martensitic phase transformation and the resulting microstructure. It is well-known that microstructure can be significantly different in thin films as compared to bulk materials. In this paper, we report on a theory of single crystal martensitic this films. We show that single crystal films of shape memory material offer interesting possibilities for producing very large deformations, at small scales.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 311
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

1. Krulevitch, P., Lee, A.P., Ramsey, P.B., Trevino, J., Hamilton, J. and Northrup, M.A., to appear in J. MEMS.Google Scholar
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