Melting temperature and order-disorder transformation of melt-spun (Fe, Pt)-Zr-B nanocrystalline alloys

The L10-FePt nanocrystalline phase is directly formed by rapidly quenching the (Fe1−xPtx)77−78Zr2−5B17−20 (x = 0.45-0.50) alloy melt. The as-quenched alloys exhibit coercivity higher than 200 kA/m. The in situ X-ray diffractometry at high temperatures reveals that the quenched L10-FePt phase in the alloys is stable up to the melting temperature. The L10-FePt phase forms directly without allowing the formation of the disordered face-centered cubic phase during rapid solidification.