Ordering, magnetostriction, and elastic properties in Fe-27.5 at. % Ga alloy single crystals
- Department of Metallurgical Engineering, University of Utah, 135 S 1460 E, Salt Lake City, Utah 84112-0114 (United States)
Fe-Ga alloys, with composition around 27.5 at. % Ga, can be heat treated to obtain {alpha} (A2, bcc), {alpha}{sup ''} (D0{sub 3}-like, ordered bcc), {beta}-Fe{sub 3}Ga (D0{sub 19}, ordered hexagonal), and {alpha}-Fe{sub 3}Ga (L1{sub 2} ordered fcc) phases. In this work, the influence of {alpha}{sup ''} ordering on the magnetostriction coefficient (3/2) {lambda}{sub 100}, elastic constants (C{sub 11}, C{sub 12}, and C{sub 44}), and the magnetomechanical coefficients (B{sub 1}) of the single crystals of {alpha}-Fe-27.5 at.% Ga and {alpha}{sup ''}-Fe-27.5 at. % Ga alloy is examined. Single crystals of Fe-27.5 at. % Ga were grown using the vertical Bridgman technique. Magnetostriction measurements were performed using [100]-oriented single crystals. Elastic constants were estimated using resonant ultrasound spectroscopy and analysis technique. It is shown that the {alpha}{sup ''} ordering in Fe-27.5 at. % Ga alloy decreases the (3/2) {lambda}{sub 100} value from that of {alpha} phase. This is consistent with our previous work on polycrystalline Fe-27.5 at. % Ga alloys. The {alpha}-Fe-27.5 at.% Ga alloy single crystal was found to have a higher magnetoelastic coupling constant than the {alpha}{sup ''}-Fe-27.5 at. % Ga alloy single crystal.
- OSTI ID:
- 21057536
- Journal Information:
- Journal of Applied Physics, Vol. 102, Issue 5; Other Information: DOI: 10.1063/1.2777155; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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