Effect of thermal history and gallium content on magneto-mechanical properties of iron gallium alloys

Thermo-mechanical and magneto-mechanical properties were studied for iron substituted with 17.5, 19.1 and 20.5 at.% gallium quenched from 1000 °C and subsequently heated to 400 °C and slow-cooled. A phase change was observed in the 19.1 and 20.5 at.% Ga quenched samples upon heating. X-ray diffracti...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2006-11, Vol.435, p.221-227
Main Authors: Datta, S., Huang, M., Raim, J., Lograsso, T.A., Flatau, A.B.
Format: Article
Language:English
Subjects:
Fe–Ga alloy
Galfenol
Magnetostriction
Structural determination
Thermal expansion
X-ray diffraction
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Summary:Thermo-mechanical and magneto-mechanical properties were studied for iron substituted with 17.5, 19.1 and 20.5 at.% gallium quenched from 1000 °C and subsequently heated to 400 °C and slow-cooled. A phase change was observed in the 19.1 and 20.5 at.% Ga quenched samples upon heating. X-ray diffraction studies on the single crystal samples showed that the phase change observed was due to the precipitation of D0 3 upon heating from the quenched state. Magneto-mechanical characterization showed that the presence of ordered D0 3 phase in the slow-cooled 19.1 at.% Ga sample reduced the saturation magnetostriction in comparison to the quenched sample of same composition. The magneto-mechanical properties of both the quenched and slow-cooled 17.5 at.% Ga samples were similar owing to the presence of only the disordered A2 phase in both these samples.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.07.115