Abstract
The Fe63B23Nd7Y3Nb3Cr1 nanocomposite magnets in the form of sheets have been prepared by copper mold casting technique. The phase evolution, crystal structure, microstructural and magnetic properties have been investigated in the as-cast and annealed states. The as-cast sheets show magnetically soft behaviors which become magnetically hard by thermal annealing. The optimal annealed microstructure was composed of nanosize soft magnetic α-Fe (19–29nm) and hard magnetic Nd2Fe14B (45–55nm) grains. The best hard magnetic properties such as intrinsic coercivity, jHc of 1119kA/m, remanence, Br of 0.44T, magnetic induction to saturation magnetization ratio, Mr/Ms=0.61 and maximum energy product, (BH)max of 55kJ/m3 was obtained after annealing at 680°C for 15min. The annealing treatment above 680°C results in non-ideal phase grains growth, which degrade the magnetic properties.
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