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Proceedings Paper

Mechanical properties of magnetostrictive iron-gallium alloys
Author(s): Rick A. Kellogg; Alan M. Russell; Thomas A. Lograsso; Alison B. Flatau; Arthur E. Clark; Marilyn Wun-Fogle
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Paper Abstract

Single crystal specimens of Fe-17 at. % Ga were tested in tension at room temperature. Specimens with a tensile axis orientation of [110] displayed slip lines on the specimen faces corresponding to slip on the {110}<111> with a critical resolved shear stress of 220 MPa. Yielding began at 0.3% elongation and 450 MPa. An ultimate tensile strength of 580 MPa was observed with no fracture occurring 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 (100) major face. A specimen with a tensile axis orientation of [100] showed slip lines corresponding to slip on the {211}<111> with critical resolved shear stress of 240 MPa. Discontinuous yielding began at 0.8% elongation, which was thought to result from twinning, kink band formation, or stress-induced transformation. The Young's modulus was 65 GPa in the loading direction with a Poisson’s ratio of 0.45 on the (001) major face. A maximum tensile strength of 515 MPa was observed with fracture occurring after 2% elongation. 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.

Paper Details

Date Published: 13 August 2003
PDF: 10 pages
Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); doi: 10.1117/12.484347
Show Author Affiliations
Rick A. Kellogg, Iowa State Univ. (United States)
Alan M. Russell, Iowa State Univ. (United States)
Thomas A. Lograsso, Iowa State Univ. (United States)
Alison B. Flatau, Univ. of Maryland, College Park (United States)
Arthur E. Clark, Clark Associates, Inc. (United States)
Marilyn Wun-Fogle, Naval Surface Warfare Ctr. (United States)


Published in SPIE Proceedings Vol. 5053:
Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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