抄録
The relations between permanent magnetic properties and microstructures of Fe-34-67.5 at%Pt binary alloys were investigated using a recording fluxmeter, X-ray diffraction and electron microscopy. The excellent permanent magnetic properties have been obtained by water-quenching from a temperature in the γ phase range and subsequent reheating at a lower temperature in the γ1 phase range. A typical Fe-38.5 at%Pt alloy exhibits the highest value of maximum energy product of 159 kJ·m−3(20 MG·Oe), with a coercive force of 340 kA·m−1(4.3 kOe) and a residual flux density of 1.08 T(10.8 kG).
It is presumed that the excellent permanent magnetic properties are related to the band microstructure of the γ1 order phase with the L10-type structure and a high crystal magnetic anisotropy.
