Tensile properties of magnetostrictive iron–gallium alloys

Date
2004-10-04
Authors
Russell, Alan
Lograsso, Thomas
Lograsso, Thomas
Flatau, A.B.
Clark, A.E.
Wun-Fogle, M.
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Elsevier
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Ames Laboratory
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Materials Science and EngineeringAmes Laboratory
Abstract
Iron–gallium alloys can produce magnetostrictions of ∼400 ppm and might function as mechanically robust actuator/sensing materials. Single crystal specimens of Fe-17 at.% Ga were tested in tension at room temperature. Specimens with a [1 1 0] tensile axis orientation exhibited {1 1 0}〈1 1 1〉 slip and an ultimate tensile strength of 580 MPa through 1.6% elongation. The Young’s modulus was 160 GPa in the loading direction with a Poisson’s ratio of −0.37 on the (1 0 0) major face. A specimen with a [1 0 0] tensile axis orientation exhibited {2 1 1}〈1 1 1〉 slip and discontinuous yielding. A maximum tensile strength of 515 MPa was observed with fracture occurring after 2% elongation. The Young’s modulus was 65 GPa in the loading direction with a Poisson’s ratio of 0.45 on the (0 0 1) major face. A sizeable elastic anisotropy of 19.9 was identified for Fe-27.2 at.% Ga accompanied by a Poisson’s ratio of −0.75 to produce a large in-plane auxetic behavior.
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This article is published as Kellogg, R. A., A. M. Russell, T. A. Lograsso, A. B. Flatau, A. E. Clark, and M. Wun-Fogle. "Tensile properties of magnetostrictive iron–gallium alloys." Acta Materialia 52, no. 17 (2004): 5043-5050. DOI: 10.1016/j.actamat.2004.07.007. Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
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Iron alloys, Magnetostriction, Slip, Elastic behavior, Auxetic
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