摘要
在铸造的RE Fe (C ,B) (RE =Nd ,Pr ,Mm )合金中获得了高的矫顽力 ,在室温 ( 30 0K)和低温 ( 10K)分别达到 12 80kA·m- 1 和 5 2 80kA·m- 1 。在原始铸态下 ,合金几乎没有矫顽力 ,它的磁硬化是在约 1173K回火 2h以上产生的。合金的矫顽力随Dy含量的增加而增大 ,B不仅对改变合金的磁性起重要作用 ,而且影响最佳的回火温度。SEM研究表明 ,合金的晶粒尺寸为 2 μm左右。X射线和TEM表明了回火后的合金是由多相组成的 ,它们分别是RE2 Fe1 4 (C ,B) ,RE2 Fe3 Cx,α Fe和RE2 Fe1 7(C ,B)相。
High coercivities were obtained in bulk RE Fe (C,B) alloys with RE=Nd, Pr and Mm. In the as cast state, the samples show a negligible coercivity H ci , and magnetic hardening is produced by annealing around 1173 K for several hours leading to H ci greater than 1200 kA·m -1 . Boron appears to be very important for achieving the high coercivity which is found to increase with the Dy content. SEM studies show a very small grain size around 2 μm. X ray and TEM studies reveal the existence of multiphases after annealing. They are RE 2Fe 14 (B,C), RE 2Fe 3C x , alpha Fe and RE 2Fe 17 (B,C) in order of their amounts. The carbide RE 2Fe 3C x has a complicated hexagonal structure with a =0.468 nm and c=0.795nm.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2001年第5期411-413,共3页
Journal of the Chinese Society of Rare Earths
基金
美国陆军研究局资助项目
