Abstract
The microstructure and the hard magnetic properties of the melt-spun (Fe1−xPtx)78Zr4B18 (x=0.385, 0.45, 0.50, and 0.55) nanocrystalline alloys have been investigated. The ordered L10-FePt phase with a grain size smaller than the critical single domain size is directly formed by rapidly quenching of the alloy melt with x=0.45 and 0.50. The alloys have a mixed microstructure composed of the L10-FePt and fcc phases, and exhibit high coercivity (Hc) of 649 and 688kA∕m, respectively, in an as-quenched state. On the other hand, the alloys with x=0.385 and 0.55 are found to composed of two fcc phases and fcc+L12-FePt3+L10-FePt, respectively, and exhibit Hc values lower than 70kA∕m in an as-quenched state. The rapidly quenching of the melt of the (Fe1−xPtx)78Zr4B18 alloys with x=0.45–0.50 is useful to realize the good hard magnetic properties through the grain size refinement of the near equiatomic FePt alloys.
Published Version
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