Abstract
(Fe 1− y Pt y ) 82B 18 ( y=0.5–0.7) alloys were adopted to study the effect of Fe/Pt ratio on the magnetic properties and phase evolution of FePtB-type nanocomposite melt spun ribbons. In addition, the differences in magnetic properties and corrosion behavior between binary FePt and ternary FePtB ribbons were also investigated. An i H c of more than 12 kOe has been obtained in (Fe 0.6Pt 0.4) 82B 18, while B r of 8.9 kG, i H c of 8.2 kOe and ( BH) max of 13.2 MGOe are achieved in (Fe 0.675Pt 0.325) 82B 18. Increasing Fe/Pt ratio was found to change the type of ferrous borides and their volume fraction, which enhanced the exchange-coupling effect between ferrous borides and magnetically hard γ 1-FePt phase, and the magnetic properties drastically. Although FePtB ribbons exhibit superior magnetic performance compares to that of FePt, they are susceptible to corrosion due to the existence of Fe–B phases in the ribbons.
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