Abstract
The magnetic properties of a magnetostrictive Terfenol-D rod produced by the hydrogen Decrepitation (HD) process from cast material of composition RFe 1.5 (R=Tb 0.27Dy 0.73) are compared with those of cast and zoned rods of composition RFe 1.9. The cast RFe 1.5 alloy disproportionates into α-iron and rare earth hydrides on exposure to hydrogen, the material re-combining on desorption of hydrogen and subsequent sintering. Magnetisation measurements show that the HD processed rod was more difficult to saturate than the cast and zoned rods. Measurements of the magneto-mechanical coupling factor k 33 also show that the HD rod requires a higher optimum dc bias field than the cast or zoned rods, giving a k 33 value of 0.28 at the highest bias field of 43 kA/m, having not yet reached its maximum value.
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