Magnetic and mechanical properties of polycrystalline Galfenol

Eric M. Summers; Thomas A. Lograsso; Jonathan D. Snodgrass; Julie C. Slaughter

doi:10.1117/12.539781

21 July 2004 Magnetic and mechanical properties of polycrystalline Galfenol

Eric M. Summers, Thomas A. Lograsso, Jonathan D. Snodgrass, Julie C. Slaughter

Proceedings Volume 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics; (2004) https://doi.org/10.1117/12.539781
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

The Zone Melt Crystal Growth Method (FSZM) has been used to produce polycrystalline Galfenol specimens, Fe_81.6Ga_18.4, with preferred {100} orientation. This crystal growth technique has advantages over conventional Bridgman methods in that zone rates used were at least an order of magnitude greater; 350 mm/hr versus 2-4 mm/hr. This material had measured magnetostrictions ranging from 168 ppm to 220 ppm compared to 290 ppm for a single crystal with a similar composition. It was discovered that upon machining a large increase in magnetostriction occurred, ~15%. Using Orientation Imaging Microscopy (OIM) techniques it was shown that the magnetostriction increase is due to the removal of off-axis grains located on the circumference of the FSZM samples. The room temperature mechanical properties were measured to be 72.4 GPa-86.3 GPa modulus of elasticity, 348 MPa-370 MPa ultimate strength, and elongation values of 0.81% - 1.2% depending upon zoning conditions.

Citation Download Citation

Eric M. Summers, Thomas A. Lograsso, Jonathan D. Snodgrass, and Julie C. Slaughter "Magnetic and mechanical properties of polycrystalline Galfenol", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); https://doi.org/10.1117/12.539781

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