Structure and magnetostriction of R(Fe0.95A10.05)x alloys (R = Dy0.65Tb0.25Pr0.1, 1.8 ≤ x ≤ 1.95)

The structure and magnetostriction of preferentially oriented polycrystalline R(Fe0.95Al0.05)x alloys (R = Dy0.65Tb0.25Pr0.1, 1.80 ≤ x ≤ 1.95) prepared by Czochralski technique, have been investigated using optical and SEM metallography, X-ray diffraction, transmission electron microscopy and standard strain gauge techniques. The alloy contains some rare earth-rich phase when x ≤ 1.85, however (Dy,Tb,Pr)(Fe,Al)3 particles emerges when x > 1.85, the amount of which increases with increasing x. X-ray diffraction analysis indicated that almost all crystallites grow along 〈110〉 direction when x ≤ 1.85 whereas part of crystallites grows along 〈112〉 direction when x ≥ 1.90. The magnetostriction along the growth direction of the samples has been assessed.