Effect of super heat treatment on crystallization behavior and magnetic properties of Nd4.5Fe77B18.5 nanocomposites
来源期刊:JOURNAL OF RARE EARTHS2010年第3期
论文作者:盛洪超 曾燮榕 邹继兆 谢盛辉
文章页码:447 - 450
摘 要:Melt-spun Nd4.5Fe77B18.5 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.
盛洪超1,曾燮榕2,3,邹继兆2,3,谢盛辉1
1. School of Materials Science and Engineering,Northwestern Polytechnical University2. College of Materials Science and Engineering,Shenzhen University3. Shenzhen Key Laboratory of Special Functional Materials
摘 要:Melt-spun Nd4.5Fe77B18.5 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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