Preparation and properties of mechanically alloyed rare earth permanent magnets

摘要: Abstract Mechanical alloying is applied to prepare Nd-Fe-B and ThMn 12 -type permanent magnets. Starting from element powders, the hard-magnetic phases are formed by milling in a planetary ball mill successive solid-state reaction at relatively low temperatures. For Nd-Fe-B, magnetically isotropic particles microcrystalline, show high coercivity (up 20 kOe for ternary alloys above Dy-substituted samples) can be used either making bonded magnets or compacted dense hot uniaxial pressing. Magnetically anisotropic samples die-upsetting. With regard grain size, magnetic properties, compaction formation of anisotropy, mechanically alloyed material comparable with rapidly quenched Nd-Fe-B. The mechanical process has also been Fe-rich RE-containing structure which interesting intrinsic properties. Most promissing Sm-Fe-Mo Sm-Fe-Ti alloys, where coercivities up 5 have achieved so far.