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Shape Memory at Nanometer Scales

Published online by Cambridge University Press:  01 February 2011

Carl Pieter Frick ,
Travis W. Lang ,
Kevin Spark  and
Ken Gall
Carl Pieter Frick
Affiliation:
Carl.Frick@colorado.edu, University of Colorado, Mechanical Engineering, UCB 427, Boulder, CO, 80309-0427`, United States, (303)735-2478
Travis W. Lang
Affiliation:
travis.lang@colorado.edu, University of Colorado, Mechanical Engineering, United States
Kevin Spark
Affiliation:
kevin.spark@colorado.edu, University of Colorado, Mechanical Engineering, United States
Ken Gall
Affiliation:
ken.gall@mse.gatech.edu, Georgia Tech, Materials Science, United States
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Abstract

Nickel-titanium (NiTi) shape memory alloys undergo relatively large recoverable inelastic deformations via a stress-induced martensitic phase transformation. The nanoindentation experimental results presented in this study are the first to show evidence of discrete forward and reverse stress-induced thermoelastic martensitic transformations in nanometer scaled volumes of material. Shape recovery due to indentation, followed by subsequent heating, is demonstrated for indents depths in the sub 10 nm range via atomic force microscopy. It is also shown that the local material structure can be utilized to modify transformation behavior at nanometer scales, yielding insight into the nature of stress-induced martensitic phase transformations at small scales and providing opportunity for the design of nanometer sized NiTi actuators.

Keywords

phase transformationnanoscalememory
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 888: Symposium V – Materials and Devices for Smart Systems II , 2005 , 0888-V04-07
Copyright
Copyright © Materials Research Society 2006

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References

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