Magnetostriction of stress-annealed Fe-Ga-Al and Fe-Ga alloys under compressive and tensile stress

Marilyn Wun-Fogle; James B. Restorff; Arthur E. Clark

doi:10.1117/12.539922

21 July 2004 Magnetostriction of stress-annealed Fe-Ga-Al and Fe-Ga alloys under compressive and tensile stress

Marilyn Wun-Fogle, James B. Restorff, Arthur E. Clark

Proceedings Volume 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics; (2004) https://doi.org/10.1117/12.539922
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

The addition of Al and Ga to b.c.c. α-Fe increases the magnetostriction of Fe in the [100] direction (a factor of 12 for Fe₈₁Ga₁₉). Fe-based magnetostrictive materials are machineable, mechanically tough and relatively inexpensive. They can be used with tensile loading and saturate in fields of only a few hundred Oe, even under compressive loads up to -100 MPa. The effects of annealing single crystal Fe_86.9Ga_4.1Al_9.0 and Fe_86.9Ga_8.7Al_4.4 and polycrystalline Fe_81.6Ga_18.4 rods under stress were examined. Stress annealing allows the material to achieve most of its strain without applying a prestress, simplifying device design. Most importantly, it allows the materials to operate magnetostrictively under a tensile load. Annealing was performed in a vacuum furnace with a -100 MPa stress for 10 minutes. The Fe-Ga-Al samples were annealed at 700°C and the Fe-Ga samples at 625°C. The magnetostriction was determined before and after stress annealing using compressive stresses of -0.7 MPa to -28 MPa for the Fe-Ga-Al samples and from ~0 to -97 MPa for the Fe-Ga samples. One of the stress annealed Fe_81.6Ga_18.4 samples was measured under tensile stresses up to 34 MPa. After annealing, all samples showed full performance at near-zero stresses and tensile stress up to +20 MPa.

Citation Download Citation

Marilyn Wun-Fogle, James B. Restorff, and Arthur E. Clark "Magnetostriction of stress-annealed Fe-Ga-Al and Fe-Ga alloys under compressive and tensile stress", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); https://doi.org/10.1117/12.539922

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available