Longhyphen;term stability of Fehyphen;Bhyphen;Ndhyphen;Dy alloys made by Dy2O3additions

摘要

For several years efforts have been devoted to increasing the coercivity of Fehyphen;Bhyphen;Nd alloys in an effort to increase the magnetic stability of this product. Some authors have shown that coercivity can be increased and irreversible losses reduced by alloying Dy with Fehyphen;Bhyphen;Nd. Ghandehari has shown that Dy2O3can be added to milled Fehyphen;Bhyphen;Nd powder compositions before sintering to increase coercivity. In this paper we studied the effects of longhyphen;term aging in air on magnets at 100 and 150thinsp;deg;C for periods up to 1500 h for selected Fehyphen;Bhyphen;Ndhyphen;Dy alloys made by the oxide addition method and compared these to an alloy made by vacuum melting the elemental metals. Metallography and microprobe data are also presented.