Characterization of Microscopic Stresses in a Polycrystalline Fe-Ga Alloy with Large Elastic Anisotropy

Abstract:

Fe-Ga alloys show large magnetostriction, which strongly depends on crystal orientation. This phenomenon is associated to some degree with large elastic anisotropy. In this study, white X-ray diffraction with micro-beam synchrotron radiation was used to evaluate the microscopic stresses evolved in a polycrystalline Fe-Ga alloy under tensile loading. In the analysis, the large elastic anisotropy of the Fe-Ga alloy was focused. The stress distribution in the alloy microstructure under tensile loading was estimated using a finite element method (FEM) simulation that considered the dependence of the elasticity on the crystal orientation. The crystal orientation of grains in the polycrystalline Fe-Ga alloy was measured using electron backscatter diffraction. The FEM simulation showed that the stress distribution in the microstructure depended on the crystal orientation. The X-ray diffraction stress analysis indicated that under tensile loading, the stresses in the alloy depended on the crystal orientation. This finding is similar to the results obtained from the FEM simulation, although the absolute values of the stresses may have reflected the effects of heterogeneous deformation on the stress distribution.

• Periodical: Materials Science Forum (Volume 905)
• Pages: 3-8
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.905.3
• Online since: August 2017
• Authors: Yusuke Onuki, Ryuji Ukai, Shigeo Sato, Shun Fujieda, Kozo Shinoda, Kentaro Kajiwara, Masugu Sato, Shigeru Suzuki*
• Keywords: Elastic Anisotropy, Iron-Gallium Alloy, Magnetostriction, X-Ray Diffraction (XRD)

References

[1] A. E. Clark, J. B. Restorff, M. Wun-Fogle, T. A. Lograsso, D. L. Schlagel, Magnetostrictive properties of body-centered cubic Fe-Ga and Fe-Ga-Al alloys, IEEE Trans. Magn. 36 (2000) 3238-3240.

DOI: 10.1109/20.908752

[2] R.A. Clark, M. Wun-Fogle, J. B. Restorff, T. A. Lograsso, Magnetostrictive Properties of Galfenol Alloys Under Compressive Stress, Mater. Trans. 43 (2002) 881-886.

DOI: 10.2320/matertrans.43.881

[3] R. A. Kellogg, A. M. Russell, T. A. Lograsso, A. B. Flatau, A. E. Clark, M. Wun-Fogle, Tensile properties of magnetostrictive iron–gallium alloys, Acta Mater. 42 (2004) 5043-5050.

DOI: 10.1016/j.actamat.2004.07.007

[4] S. Datta, J. Atulasimha, C. Mudivarthi, A.B. Flatau, Stress and magnetic field-dependent Young's modulus in single crystal iron–gallium alloys, J. Magn. Magn. Mater. 322 (2010) 2135–2144.

DOI: 10.1016/j.jmmm.2010.01.046

[5] K. Kajiwara, M. Sato, T. Hashimoto, I. Hirosawa, T. Yamada, T. Terachi, T. Fukumura, K. Arioka, Development of visualization method of grain boundaries in stainless steel by using white X-ray micro-beam and image detector, Phys. Status Solidi A 206 (2009).

DOI: 10.1002/pssa.200881610

[6] K. Kajiwara, M. Sato, T. Hashimoto, T. Yamada, T. Terachi, T. Fukumura, K. Arioka, Evaluation of internal stress in individual grains of cold-rolled stainless steel by energy dispersive X-ray diffraction, ISIJ International, 53 (2013) 165-169.

DOI: 10.2355/isijinternational.53.165

[7] S. Suzuki, K. Hotta, E. P. Kwon, S. Fujieda, K. Shinoda, M. Kumagai, M. Imafuku, K. Kajiwara, M. Sato, S. Sato, Characterization of evolution of microscopic stress and strain in high-manganese twinning-induced plasticity steel, ISIJ International, 55 (2015).

DOI: 10.2355/isijinternational.isijint-2014-378

[8] M. E. Fitzpatrick, A. Lodini (Eds. ), Stress analysis, Analysis of Residual Stress by Diffraction Using Neutron and Synchrotron Radiation, Taylor & Francis, New York, 2003, p.48.

DOI: 10.1201/9780203608999