Study on Nd-rich Phase Distribution and the Effect of Ultrasonic Vibration in Hot-Deformed Nd-Fe-B Magnet AITranslate

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Chinese Library Classification Number:TM273[一般工业技术—材料科学与工程]

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The morphology and distribution of Nd-rich phase during conventionally hot pressing,hot deformation and ultrasonic vibration-assisted hot deformation of Nd-Fe-B magnets were studied by SEM analysis and magnetic property test,and the effect of ultrasonic vibration on the magnetic properties of Nd-Fe-B magnets was also studied.The results show that part of the Nd-rich phases in the melt-spun ribbon of the magnet are squeezed into the gap of the melt-spun ribbon during the hot pressing process,and as the hot pressing temperature increases,an obvious blocky Nd-rich phase appears.During the hot deformation process,the melt-spun ribbon in the hot-pressed magnet deforms under the combined action of pressure and high temperature.Some Nd-rich phases in the melt-spun ribbon are further squeezed to the outside of the melt-spun ribbon,and some Nd-rich phases are enriched inside the melt-spun ribbon under the effect of pressure.After adding a certain amount of ultrasonic vibration during the hot deformation process,it is found that the number and area fraction of the blocky Nd-rich phase in the magnet significantly reduce,and the distribution of the Nd-rich phase becomes more uniform.Ultrasonic vibration can promote the diffusion movement of liquid Nd-rich phase,making it more difficult to enrich to form blocky Nd-rich phase,and improving the coercivity of the magnet.