Influence of yttrium on the structure and magnetostriction of Fe₈₃Ga₁₇ alloy

Abstract

Polycrystalline Fe₈₃Ga₁₇ alloy rods with various amounts of yttrium were prepared by high vacuum induction melting. It is found that yttrium addition has a significant effect on the structure and magnetostriction of Fe₈₃Ga₁₇ alloy. The small addition of yttrium alters the solidification character and the grain shape of Fe₈₃Ga₁₇ alloy, and as a result, columnar grains with the 〈100〉 preferential direction are produced. Yttrium addition improves the magnetostrictive performance of the as-cast Fe₈₃Ga₁₇ alloy. The magnetostriction values of the as-cast alloy with 0.32at% and 0.64at% yttrium addition go up to 119×10⁻⁶ and 137×10⁻⁶ under 15 MPa compressive stress, respectively. The energy dispersive spectroscopy (EDS) result shows that almost all of the yttrium atoms exist in the Y₂Fe_17−xGa _x phase. A small amount of this kind of secondary phase cannot obviously increase the saturate magnetic field.

Keywords

gallium alloys / iron alloys / yttrium / magnetostriction / supercooling / polycrystalline materials

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