Effects of Ultrasonic Vibration on Grain Size and Orientation of Hot-Deformed Nd-Fe-B 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 investigate the effects of ultrasonic vibration on the grain size and preferred orientation of hot-deformed Nd-Fe-B magnet and the mechanisms,ultrasonic vibration was applied during the hot deformation process of Nd-Fe-B.The grain size distribution of the magnet was analyzed through SEM images and Image Pro Plus software.The grain orientation degree of the magnet was analyzed by XRD patterns and SEM grain morphology.Additionally,the strain activation energy and magnetic properties of the magnet were analyzed.The results indicate that ultrasonic vibration has a grain refinement effect on the hot-deformed Nd-Fe-B,and its average grain size in the refined region decreases by about 50%compared with the conventionally hot-deformed magnet.Moreover,increasing the ultrasonic power density can significantly enhance the grain refinement effect.Ultrasonic vibration promotes the rotation of the grains of the main magnetic phase,and more grains align their c-axis with the pressure direction,improving the overall preferred orientation.In addition,ultrasonic vibration promotes the uniform distribution of grain orientation in the radial direction of the magnet,reducing the difference in the remanence of the hot-deformed magnet along the radial direction.