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The effect of partial substitution of Ge for Ga on the elastic and magnetoelastic properties of Fe–Ga alloys
Ames Laboratory Conference Papers, Posters, and Presentations
  • G. Petculescu, University of Louisiana at Lafayette
  • A. O. Mandru, University of Louisiana at Lafayette
  • William M. Yuhasz, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • M. Wun-Fogle, United States Navy
  • J. B. Restorff, United States Navy
  • A. E. Clark, Clark Associates
  • K. B. Hathaway, G/J Associates
Document Type
11th Joint MMM–Intermag Conference
Publication Date
(38.90723089999999, -77.03646409999999)
Both components of the tetragonal magnetoelastic constant b1: the saturation magnetostriction, λγ,2 = (3/2)λ100, and the magnetic-field saturated shear elasticity, c′ = (c11−c12)/2, were investigated over a wide temperature range for the magnetostrictiveFe1−x−yGaxGey alloys, (x+y ≅ 0.125, 0.185, and 0.245; x/y ≅ 1 and 3). The magnetostriction was measured from 77 to 425 K using standard strain gage techniques. Both shear elastic constants (c′ and c44) were measured from 5 to 300 K using resonant ultrasound spectroscopy. Six alloy compositions were prepared to cover three important regions: (I) the disordered solute α-Fe region, (II) a richer solute region containing both disordered and ordered phases, and (III) a rich solute region containing ordered multiphases. Our observations reveal that, when the data is presented versus the total electron/atom (e/a) ratio, the above regions for both the ternary and binary alloys are in almost perfect alignment. Following this analysis, we find that the magnetoelastic coupling, b1, peaks for both the binary and the ternary alloys at e/a ∼ 1.35. The values of c′ as well as of λγ,2 in region I of the ternary alloys, when plotted versus e/a, fall appropriately between the binary limits.

Copyright 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The following article appeared in Journal of Applied Physics 107 (2010): 09A926 and may be found at

Copyright Owner
American Institute of Physics
Citation Information
G. Petculescu, A. O. Mandru, William M. Yuhasz, Thomas A. Lograsso, et al.. "The effect of partial substitution of Ge for Ga on the elastic and magnetoelastic properties of Fe–Ga alloys" Washington, DC(2010)
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