Abstract
Magnetic properties of Tb-Dy-Fe alloy made by the mechanical alloying (MA) and the pulsed current sintering method was investigated. The MA was performed in a planetary ball mill. The powders were prepared by the MA of the mixture of the elemental Th, Dy and Fe powders for (TbxDy1-x)Fe1.8 (x=0-1.0). The MA powders were heat treated at several temperature and consolidated at 1073K. From the result of VSM analysis, it was found the coercivity of the MA powder milled after 360ks was large and the magnetization was small. After heat treated at 673K, coercivity of the powder became smaller and magnetization of the powder became larger. It is conjectured that materials with small coercivity shows good magnetostrictive properties. The magnetic hysteresis loop was not depend on the composition of (TbxDy1-x)Fe1.8 (x=0-1.0). It is considered that the large current passed the sample would create the magnetic field around the sample during SPS. But magnetic anisotropy of the sintered sample was not observed by the VSM. Magnetostriction of sintered (Tb0.5Dy0.5)Fe1.8 alloy was as large as TbFe2 which was made by A.E. Clark and H.S. Belson.
