摘要
探讨了880～900℃、910～930℃、940～960℃温度区间下1h回火处理对Nd30Dy3.5Al0.2B1合金显微组织和磁性能的影响.研究表明,温度低于910℃时,晶界富Nd带过厚且积聚,主相体积分数小,矫顽力、磁能积低;温度高于930℃时,晶粒尺寸过大,晶界面积变小, 晶界富Nd带加厚, 矫顽力、磁能积均下降;910～930℃时晶粒尺寸趋向均匀, 晶界富Nd带呈薄层状分布,磁性能最佳.
The effect of tempering process on the microstructure and magnetic properties of sintered Nd-Fe-B magnets were investigated. It was manifested that when the tempering temperature was below 910℃, the Nd-rich phase on grain boundary gathered and a wide band of the Nd-rich phase formed, the volume fraction of matrix phase was small and so the magnetic properties of the magnets were low. When the temperature was above 930℃, the grain size became coarse, the grain boundary area became smaller, the band of the Nd-rich phase on grain boundary became wider and the magnetic properties of the magnets were deteriorated. When the temperature is between 910℃ and 930℃ ,the grain size was inclined to be uniform, the content of clustered Nd-rich phase reduced, the magnetic properties of magnets were optimized. So the proper temperature for the first tempering of Nd30Dy3.5A10.2B1 alloy shall be from 910℃ to 930℃.
出处
《材料开发与应用》
CAS
2005年第6期24-26,共3页
Development and Application of Materials
