Effect of Ultrasonic Vibration on the Melt-Spun Ribbon Boundary Region during Hot Deformation of Nd-Fe-B Magnets 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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To regulate the microstructure of the boundary region of the melt-spun ribbons in hot-deformed Nd-Fe-B magnets,ultrasonic vibration was applied during the hot deformation process of the Nd-Fe-B magnets.The microstructure of the melt-spun ribbon boundary region in the hot-pressed precursor was studied.The effects of conventional hot deformation and ultrasonic hot deformation on the distribution of the Nd-rich phase and the grain size in the melt-spun ribbon boundary region of Nd-Fe-B magnets were investigated,and the morphological evolution laws of the melt-spun ribbon boundary region were summarized.The results show that the microstructure of conventional hot-deformed Nd-Fe-B magnets retains the quasiperiodic distribution characteristics of the hot-pressed precursor's microstructure,with the continuously distributed strip-like Nd-rich phase at the periodic interface being wider.However,in the melt-spun ribbon boundary region in ultrasonic hot-deformed Nd-Fe-B magnets,the strip-like distribution of the Nd-rich phase is weakened.Instead,the Nd-rich phase gradually disperses and spreads toward the interior of the melt-spun ribbons,tending to distribute around the internal grains,which is conducive to improving the intergranular exchange coupling.In addition,compared with conventional hot-deformed Nd-Fe-B magnets,the grains in the coarse-grained region of the melt-spun ribbon boundary region in ultrasonic hot-deformed magnets are refined to a certain extent:the average grain size decreases from 2.17μm(conventional hot deformation)to 1.96μm(ultrasonic hot deformation),with a reduction of approximately 9.6%.