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Isothermal Martensitic Transformation Kinetics in Ni-Mn-Sn Ferromagnetic Shape Memory Alloys

Published online by Cambridge University Press:  31 January 2011

Patrick Shamberger ,
Alexandre Pakhomov  and
Fumio Ohuchi
Patrick Shamberger
Affiliation:
pjsham@u.washington.edu, University of Washington, Materials Science & Engineering, Seattle, Washington, United States
Alexandre Pakhomov
Affiliation:
pakhomov@uw.edu, University of Washington, Materials Science & Engineering, Seattle, Washington, United States
Fumio Ohuchi
Affiliation:
Ohuchi@u.washington.edu, University of Washington, Materials Science & Engineering, Seattle, Washington, United States
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Abstract

This study examines the kinetics of the martensitic phase transformation in a representative Ni-Mn-Sn Heusler alloy. Here, we present data on isothermal and continuous cooling/warming transformations in both bulk polycrystalline and individual small particle samples. We demonstrate that while the martensite to austenite transformation proceeds very rapidly (faster than the time-scale of our observations), the austenite to martensite transformation has a significant isothermal component. A similar asymmetry is also noted in transformation behavior of individual martensite plates. We conclude that the observed time dependence is due primarily to nucleation-limited kinetics.

Keywords

kineticsphase transformationnucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1200: Symposium G – Magnetic Shape Memory Alloys , 2009 , 1200-G02-04
Copyright
Copyright © Materials Research Society 2010

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