Title :
Effect of two-step annealing on magnetic properties of Pr-Fe-B base hot-rolled magnet
Author :
Yuri, Tsukasa ; Ohki, Tsuguaki
Author_Institution :
Kobe Steel Ltd., Hyogo, Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
Magnetic properties of a Pr-Fe-B base magnet produced by the hot-rolling method are improved remarkably by a characteristic two-step annealing. The relationship between magnetic properties and microstructure in the two-step annealing is investigated for a Pr15 Fe78.0B5.5Cu1.5 (at.%) hot rolled magnet, and the effect of Ga replacement for Cu is investigated for Pr 15Fe79.0B5.5Ga0.5 (at.%). The effect of the two-step annealing is attributed to recovery of disordered microstructure by first step annealing and development of network structure of Pr-rich phase by second-step annealing. The Ga replacement for Cu enhances the improvement of magnetic properties through formation of a more desirable microstructure by the two-step annealing
Keywords :
annealing; boron alloys; coercive force; crystal microstructure; ferromagnetic properties of substances; hot rolling; iron alloys; magnetisation; permanent magnets; praseodymium alloys; Pr-Fe-B base magnet; Pr15Fe78.0B5.5Cu1.5; Pr15Fe79.0B5.5Ga0.5; hot-rolled magnet; intrinsic coercive force; magnetic properties; microstructure; network structure; permanent magnets; residual magnetisation; two-step annealing; Annealing; Coercive force; Cooling; Demagnetization; Human computer interaction; Magnetic properties; Microstructure; Scanning electron microscopy; Steel; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
