Abstract
The magnetic properties of cast and hot-rolled Pr/sub 17/Fe/sub 77.5/B/sub 4/ M/sub 1.5/ (M=Cu, Ga, Ag, Al, In, and Pb) alloys were investigated in order to explore the role of additive elements in improving the magnetic properties in the Pr-Fe-B system. It is found that Ga and Ag additions have an effect similar to that of Cu in increasing the coercivity in both cast and hot-rolled specimens. Al and In additions do not have these positive effects, while the Pb addition deteriorates the magnetic properties and workability. The coercivity of the hot-rolled magnets containing Ga, Ag, or Cu can easily reach 10 kOe or greater. This is due to the grain refinement as well as the enhanced smoothing of grain boundaries. >
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