摘要
The effect of Ce, Co, and B on the formation of 1：13 phase in La（Fe, Si）13 alloys was investigated by XRD, SEM and EDS. The results show that Co can improve the formation of 1：13 phase in as-cast LaFe11.6-xCoxSi1.4 alloys, but in as-cast and annealed LaFe11.6Si1.4-xCox alloys, it will hamper the formation of 1：13 phase and help the formation of a-Fe（Co, Si） solid solution. Ce2Fel7 phases will form when x reaches a certain value in as-cast and annealed La1-xCexFe11.5Si1.5 alloys. B can improve the formation of 1：13 phase accompanied with Fe2B phase in as-cast LaFe11.6-xBxSi1.4 alloys. B improves the formation of a-Fe solid solution in LaFe11.6Si1.4-xBx alloys, and there is almost only a-Fe in as-cast and annealed LaFe11.6Si0.9B0.5 alloy. In all, the introduction of Co, B, and Ce cannot eliminate the a-Fe phases in corresponding alloys prepared by the high-temperature and short-time annealing process.
通过XRD、SEM、EDS等方法,研究Ce、Co、B对La(Fe,Si)13合金中LaCo13结构1:13相形成的影响。结果表明,在铸态LaFe11.6-xCoxSi1.4合金中,Co能够促进铸态1:13相的形成。但是在铸态以及热处理后的LaFe11.6Si1.4-xCox合金中,Co阻止1:13相的形成,同时促进α-Fe(Co,Si)固溶体相的形成。在铸态La1-xCexFe11.5Si1.5合金中,当Ce的含量达到一定值后,合金中将有Ce2Fe17相形成,且随着Ce含量的增加而增加。在铸态LaFe11.6-xBxSi1.4合金中,B能够促进1:13相的形成,但同时会有Fe2B相产生。在铸态以及热处理后的LaFe11.6Si1.4-xCox和LaFe16Si1.4-xBx合金中,Co能够促进α-Fe(Co,Si)固溶体相的形成。在LaFe11.6Si0.9B0.5合金中,基本上只有α-Fe(Co,Si)固溶体相存在,这点与LaFe11.6Si0.7Co0.7合金相似。在高温短时热处理制备的La(Fe,Si)13合金中,引入Ce、Co、B并不能消除杂相α-Fe,且同时会伴随新的杂相产生,如Ce2Fe17和Fe2B相。
基金
Project(51176050)supported by the National Natural Science Foundation of China
Project(12ZB073)supported by the Research Projects in Sichuan Province Education Office,China
