Melt-spun Nd4.5Fe4.5B18.5 ribbons were prepared under various superheat temperatures.The microstructure characteristics,crystallization behavior,and subsequent magnetic properties of Fe3B/Nd2Fe14B nanocomposite magnets were investigated using X-ray diffraction,differential thermal analysis,and vibrating sample magnetometry.It was shown that melt spinning at different quenching temperatures caused the as-quenched ribbons to have distinctive crystallization behavior.Depending on superheat temperature,phase transformation of the ribbons during annealing may take place in one of the following sequences:(1)amorphous phase(Am)→Am'+Fe3B→Fe3B+Nd2Fe23B3→Fe3B+Nd2Fe14B,or(2)amorphous phase(Am)→Am'+Fe3B→Fe3B+Nd2Fe14B.For the latter,the ribbon after optimal annealing exhibited single-phase magnetic behavior.In the first case,magnetic properties of the optimally heat treated ribbons deteriorated and an apparent kink could be seen along the demagnetization curves near the zero field.
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