Small amounts of Al and Mn were introduced to partly substitute for Fe in polycrystalline Terfenol alloy TbFe2 as Tb(Fe0.9MnxAl0.1−x)2(x=0–0.1). Their effects on structure, magnetic properties, magnetostriction, and hardness were studied. X-ray diffraction shows that the studied alloys remain cubic Laves phase. The saturation magnetization increases with Mn content. Curie temperature dramatically decreases with Mn addition and is further lowered due to the Al replacement. A magnetostriction of 1890 ppm at 19 kOe was obtained in the modified alloy x=0.06. Magnetostriction value at low field is distinctly greater, especially when x=0.04, than that of the TbFe2 or the Mn/Al. At 1 kOe, the magnetostriction of the x=0.04 alloy is 250 ppm compared to, 22 ppm in the base alloy. Addition of both Mn and Al improves the maximum value of dynamic strain coefficient d33(max) and lowers the corresponding field for Tb(Fe0.9MnxAl0.1−x)2 alloys as compared with the base alloy. When x=0.04, d33(max) is 360×10−9 Oe−1, 1.7 times higher than that of the base alloy, while the corresponding field is 0.562 kOe, 3.1 times lower than that of the base alloy.
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