摘要
采用不同的淬速（辊速Vs=10,15,20,25,30 m·s^-1）制备了Nd9Fe70Ti3C1Nb3B14合金快淬薄带,并研究了薄带的晶化相变及其退火后的磁性能随快淬速度提高而发生的变化。结果表明：在淬速15和20 m·s^-1之间有一个临界淬速,在临界淬速以下制备的低淬速薄带由非晶和少量Nd2Fe（14）B,Fe3B和α-Fe纳米晶组成,而在临界淬速以上制备的高淬速薄带由完全非晶构成。随着淬速的提高,薄带中非晶的热稳定性逐步提高。低淬速薄带晶化过程的相变为AP＋Nd2Fe（14）B＋Fe3B＋α-Fe→Nd2Fe（14）B＋Fe3B＋α-Fe＋Nd3Fe（20）B2→Nd2Fe（14）B＋Fe3B＋α-Fe,而高淬速薄带晶化过程的相变为AP→AP＇＋Nd3Fe（20）B2→Fe3B＋Nd3Fe（20）B2→Nd2Fe（14）B＋Fe3B＋α-Fe。优化退火后,尽管不同淬速薄带的剩磁差别不大,但低淬速薄带的最佳矫顽力和磁能积分别比高淬速薄带的高28.41%和20.12%。
A series of Nd9Fe70Ti3C1Nb3B15 melt-spun ribbons were prepared by rapid quenching at different wheel speeds(Vs= 10,15,20,25,30 m·s^-1）,and the changes of their crystallization phase transition and magnetic properties after post annealing with the increase of quenching wheel speed were investigated. The results showed that there was a critical quenching wheel speed Vc,which was between 15 and 20 m·s^-1. When Vswas below Vc,the ribbons(named low quenching speed ribbons） consisted of amorphous phase and a little amount of Nd2Fe（14）B,Fe3B and α-Fe nanocrystals,but when Vswas above Vc,the ribbons(named high quenching speed ribbons） consisted of complete amorphous. The thermal stability was enhanced with Vsincreasing. The crystallization phase transition of low and high quenching speed ribbons could be deduced respectively as follows： AP ＋ Nd2Fe（14）B ＋ Fe3B ＋ α-Fe →Nd2Fe（14）B ＋ Fe3B＋ α-Fe ＋ Nd3 Fe20 B2→Nd2Fe（14）B ＋ Fe3B ＋ α-Fe; and AP→AP＇ ＋ Nd3Fe（20）B2→Fe3B ＋ Nd3 Fe20 B2→Nd2Fe（14）B ＋ Fe3B ＋ α-Fe. After the optimal annealing,the optimum coercivity and energy product of the former were 28. 41% and 20. 12% higher than that of the latter,respectively,with their remanence values very close.
作者
徐山雪
潘晶
刘新才
赵丽
Xu Shanxue;Pan Jing;Liu Xincai;Zhao Li(Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2018年第5期491-497,共7页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51174121,51274125)
浙江省重点科技创新团队项目(2012R10016-08)
宁波大学王宽诚幸福基金项目资助
关键词
纳米复合永磁合金
快淬速度
晶化相变
磁性能
nanocomposite permanent alloy
quenching wheel speed
crystallization phase transition
magnetic properties
