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Nonthermoelastic and Thermoelastic Martensitic Transformation Behavior Characterized by Acoustic Emission in An Fe-Pt Alloy

Published online by Cambridge University Press:  10 February 2011

H. Ohtsuka ,
K. Takashima  and
G. B. Olson
H. Ohtsuka
Affiliation:
National Research Institute for Metals, 1–2–1 Sengen, Tsukuba, Ibaraki 305, Japan. ohtsuka@nrim.go.jp
K. Takashima
Affiliation:
Department of Materials Science and Mechanical Engineering, Kumamoto University, 2–39–1 Kurokami, Kumamoto 860, Japan.
G. B. Olson
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2225 N. Campus Dr., Evanston IL, 60208–3108, U.S.A.
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Abstract

Acoustic emission (AE) signals generated during the martensitic transformation in an Fe-24at%Pt alloy with various ordering treatments have been measured, and the AE parameters have been correlated with phase transformation events. AE events are generated during cooling of specimens, which is the first detection of the AE events associated with the martensitic transformation in Fe-Pt alloys. In all specimens, AE events were observed at higher temperature than the Ms temperatures determined by electrical resistivity measurement. AE events started to increase abruptly for the weakly ordered specimen with decreasing temperature. In contrast, AE events increased gradually for the highly ordered specimen with decreasing temperature. This is consistent with the nature of the transformation behavior in this alloy. The critical defect size of weakly ordered and highly ordered specimens were calculated using Ms temperature determined by AE technique. Results obtained in this investigation strongly suggests that the AE technique is useful for analysis of transformation kinetics in this alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 407
Copyright
Copyright © Materials Research Society 1997

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References

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