Effects of boron on the magnetostrictive properties of Tb0.27Dy0.73Fe2

The magnetostrictive properties and microstructure of Tb0.27Dy0.73Fe2Bx (x = 0, 0.05, 0.1, 0.15, 0.2) have been investigated. Measurement of magnetic properties, X-ray diffraction and magnetostriction were made on Tb0.27Dy0.73Fe2Bx polycrystalline samples prepared by the arc melting technique. With the increase of boron context x, the iron-rich phase which leads to the detriment of magnetostrictive properties decreases obviously. The matrix phase of these alloys also has an MgCu2 structure type. The lattice constant and Curie transition temperature change only slightly. Doping of boron in the Tb0.27Dy0.73Fe2 alloy can restrain the emergence of an iron-rich phase. The peritectic action point either shifts slightly or the peritectic action is promoted by boron.