Mechanical properties of magnetostrictive iron-gallium alloys

Rick A. Kellogg; Alan M. Russell; Thomas A. Lograsso; Alison B. Flatau; Arthur E. Clark; Marilyn Wun-Fogle

doi:10.1117/12.484347

13 August 2003 Mechanical properties of magnetostrictive iron-gallium alloys

Rick A. Kellogg, Alan M. Russell, Thomas A. Lograsso, Alison B. Flatau, Arthur E. Clark, Marilyn Wun-Fogle

Proceedings Volume 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics; (2003) https://doi.org/10.1117/12.484347
Event: Smart Structures and Materials, 2003, San Diego, California, United States

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.

Citation Download Citation

Rick A. Kellogg, Alan M. Russell, Thomas A. Lograsso, Alison B. Flatau, Arthur E. Clark, and Marilyn Wun-Fogle "Mechanical properties of magnetostrictive iron-gallium alloys", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.484347

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