Abstract
Effects of refractory elements on the phase evolution, magnetic properties, and microstructure of melt-spun Fe 56.7Pt 27.3B 16 and Fe 56.7Pt 25.3M 2B 16 (M = Ta, Nb, Ti, and Zr) ribbons have been investigated. It is found that multiple phases, namely magnetically hard L1 0-FePt, magnetically soft Fe 2B and Fe 3B phases, can be readily formed in the above alloy ribbons after an isothermal annealing treatment. The refractory elements on the Fe 56.7Pt 25.3M 2B 16 ribbons tend to react with boron to form borides or a solid solution along the grain boundaries, which impedes the disorder to order transformation of L1 0-FePt phase. A higher annealing temperature is necessary for the formation of ordered L1 0-FePt phase, giving rise to the formation of coarse grains or inhomogeneous grains. Consequently, the intrinsic coercivity ( i H c) and reduced remanence ratio ( σ r/ σ 12 kOe ) are reduced from 7.5 kOe and 0.85 for Fe 56.7Pt 27.3B 16 to 3.3–6.1 kOe and 0.75–0.81 for Fe 56.7Pt 25.3M 2B 16, respectively.
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