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Proceedings Paper

Evaluation of phase transformation in ferromagnetic shape memory Fe-Pd alloy by magnetic Barkhausen noise
Author(s): Yasubumi Furuya; Shizuka Tamoto; Takeshi Kubota; Teiko Okazaki; Nesbitt W. Hagood; S. Mark Spearing
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Paper Abstract

The possibility to detect the phase transformation with martensites by heating or cooling as well as stress-loading in ferromagnetic shape memory Fe-30at percent Pd alloy thin foil by using magnetic Markhausen noise sensor was studied. MBHN is caused by the irregular interactions between magnetic domain and thermally activated martensite twins during magnetization. In general, the envelope of the MBHN voltage versus time signals in Fe-29at percent Pd ribbon showed two peaks during magnetization, where secondary peak at intermediate state of magnetization process decreased with increasing temperature, while the MBHN envelopes in pure iron did not change with increasing temperature. The variety of MBHN due to the phase transformation was apt to arise at higher frequency part of spectrum during intermediate state of magnetization process and it decreased with disappearance of martensite twins. Besides, MBHN increased monotonically with increasing loading stress and then, it decreased with unloading, however MBHN showed large hysteresis between loading and unloading passes. Based on the experimental results from MBHN measurements for both thermoelastic and stress-induced martensite phase transformations in Fe-30at percent Pd ribbon samples, MBHN method seems a useful technique to non-destructive evaluation of martensite phase transformation of ferromagnetic shape memory alloy.

Paper Details

Date Published: 11 July 2002
PDF: 9 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.474994
Show Author Affiliations
Yasubumi Furuya, Hirosaki Univ. (Japan)
Shizuka Tamoto, Hirosaki Univ. (Japan)
Takeshi Kubota, Hirosaki Univ. (Japan)
Teiko Okazaki, Hirosaki Univ. (Japan)
Nesbitt W. Hagood, Massachusetts Institute of Technology (United States)
S. Mark Spearing, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4699:
Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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