熔体快淬Pr(Fe1-xCox)2合金的结构和磁性

Pr(Fe 1-x Co x ) 2 ribbons have been prepared by melt-spinning method. Their structure, magnetic properties and thermal stability are investigated. It is found that Pr(Fe,Co) 2 cubic Laves phase can form only when x≥0.2 at wheel speed of 45m/s. For Pr(Fe 0.6 Co 0.4 ) 2 alloy, at wheel speed of 30m/s, the ribbon consistes of a mixture of Pr 2 (Fe,Co) 17 , Pr(Fe,Co) 2 and rare earth-rich phase. Almost Pr(Fe 0.6 Co 0.4 ) 2 compound a small amount of amorphous phase is observed at wheel speed up to 45m/s. Pr(Fe 0.6 Co 0.4 ) 2 compound becomes unstable above 770℃. The resub-bonded Pr(Fe 0.6 Co 0.4 ) 2 nanocrystalline compound which is obtained at wheel speed of 40m/s combines high magnetostriction (λ ∥ -λ ⊥ =140×10 -6 ), with significant magnetic coercivity, i H c =398kA/m.