Effect of Dy doping on magnetostrictive and mechanical properties of Fe83Ga17 alloy

Fe 83 Ga 17 alloy is a kind of promising magnetostrictive alloys with high magnetostrictive properties and a low saturation magnetic field. As-cast Fe 83 Ga 17 Dy x ( x =0, 0.05, 0.1, 0.2, 0.4) polycrystalline alloys were prepared by arc melting. Effect of Dy doping on the microstructure, magnetostrictive and mechanical properties of as-cast Fe 83 Ga 17 alloy was investigated. Results show that Dy-doped alloys exhibit a dual-phase structure containing the A2 matrix and Dy-rich precipitates (Fe 56 Ga 34 Dy 10 ). Both magnetostriction and mechanical properties of Fe 83 Ga 17 alloys are improved by Dy doping. A small amount of Dy addition ( x =0.2) significantly causes Fe 83 Ga 17 alloy to transform from typical brittle material (fracture strain ε