【摘要】 利用低温液氮球磨技术制备了Sm-Fe合金粉体,采用XRD、HRTEM和惰性气脉冲-红外-热导等方法对Sm2Fe17合金粉体在液氮球磨过程中的组织演变进行了研究。结果表明,液氮球磨可加速细化Sm-Fe合金粉体。球磨5h后,Sm-Fe合金的晶粒尺寸约为10nm,9h后晶粒尺寸约为5nm。Sm-Fe合金中的氮含量随着球磨时间的延长而增加,主轴转速150r/min球磨9h后,氮含量达1.62%(质量分数,下同)。随着球磨时间的延长,Sm2Fe17相向非晶态转变,降低球磨转速可以延缓非晶的形成过程。更多还原

【Abstract】 The Sm-Fe alloy powders were prepared by cryomilling in liquid nitrogen.By means of XRD,HRTEM and Inert Gas Pulse-Infrared-Thermal Conductivity method,the microstructure evolution of the Sm2Fe17 alloy powders during the cryomilling process was studied.The results show that the grain sizes of Sm-Fe alloy powders were rapidly reduced by cryomilling in liquid nitrogen.The grain sizes of the alloy powders were about 10 nm and 5 nm after cryomilling for 5 h and 9 h,respectively.The nitrogen content in the Sm-Fe alloy powders increased with longer cryomilling time.After cryomilling at 150 r/min for 9 h,the content of nitrogen reached 1.62wt%.With increasing of the cryomilling time,the Sm2Fel7 phase changed to amorphous phase.Low cryomilling speed can slow down the formation of amorphous phases.更多还原