引言目前,对钴同所有工艺上重要的稀土金属的二元系相图都已作了研究[1-16]。Lemaire[17]对直到1966年所发表的有关稀土-钴合金及金属间相的冶金性能和磁性的资料,作出了出色的评论。表1的调查(此表按年代顺序列出阐述相图研究的一些文献)表明,大多数相图文献是在1966年以后发表的。那时,Strnat 等人[18-20]就表示过,某些 RCo_5有可能 INTRODUCTION At present, the binary phase diagrams of cobalt with all technically important rare earth metals have been studied [1-16]. Lemaire [17] made excellent reviews of the metallurgical properties and magnetic properties of rare earth-cobalt alloys and intermetallics until 1966. The survey in Table 1, which lists in chronological order some of the documents that illustrate phase diagram studies, shows that most of the phase diagram documents were published after 1966. At that time, Strnat et al. [18-20] said that some RCo_5s are possible