Magnetic and structural anisotropic properties of magnetostrictive Fe-Ga flake particles and their epoxy-bonded composites

• Published in: Materials letters 2018-02, Vol.213, p.326-330
• Main Authors: Na, Suok-Min, Park, Jung-Jin, Lee, Seunghun, Jeong, Se-Young, Flatau, Alison B.
• Format: Article
• Language: English
• Subjects: Alloys; Anisotropy; Composite; Composite materials; Crystal structure; Crystallography; Deformation mechanisms; Energy consumption; Fe-Ga alloy; Flakes; Magnetic anisotropy; Magnetic properties; Magnetism; Magnetization; Magnetostriction; Materials science; Microstructure; Particulate composites; Polymer matrix composites; Powder
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2017.11.052

[Display omitted] •Cube-face (1 0 0) crystal plane fracture leads to formation of grain-oriented flakes.•Flake shape is beneficial to control magnetic shape anisotropy in composite.•Magnetic field alignment of particles improves magnetostrictive performances. Flake shaped particles of grain-oriented Fe80Ga20 and Fe73Ga27 alloys were prepared using a high-energy wet ball-milling process. The surface of flakes produced were predominantly parallel to the (1 0 0) crystallographic plane in flakes. These flakes possess two in-plane 〈1 0 0〉 easy axes of magnetization, which enhances magnetostrictive performance and sensitivity for use in composite materials. The deformation mechanism leading to formation of (1 0 0) grain-oriented flakes is associated with small angel crystal reorientations along slip lines similar to what occurs during rolling. Data are presented on the in-plane magnetic properties of these flakes, which were characterized using field-dependent magnetization measurements. The epoxy-bonded composites with the particle alignment exhibited high magnetostriction values of  ∼103 ppm.