Rodlike disproportionation microstructure in the Pr13Fe80B7 alloys treated by conventional HDDR process

Anisotropic Pr13Fe80B7 magnetic powders are obtained by shortening the disproportionation time ofthe hydrogenation disproportionation desorption recombination (HDDR) process. The magnetic powders with a disproportionation time of 30 min have the magnetic properties of B-r=0.93 T and M-r/M-s=0.75, and show a high degree of crystal texture along the c axis, whereas the magnetic powders obtained with a prolonged disproportionation time are isotropic. A rodlike structure is observed in the 30 min-disproportionation products and is transformed into spherical morphology with a prolonged disproportionation time. It suggests that the rodlike disproportionated microstructure is very important for the formation of crystal texture in the conventional HDDR powders. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3347742]http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000277834300086&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, AppliedSCI(E)EICPCI-S(ISTP)