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用X射线衍射、金相观察、电子探针、透射电镜和磁性测量研究了Gd2Co17-xAlx(x≤5)合金的微结构、相组成、相成分和热磁特性.结果表明,在1173和1323K退火的x≤3的样品和在1323K退火的x=4的样品近似为单相,2:17主相仅含Gd、Co、Al 3种元素,具有菱方Th2Zn17型结构,少量杂质相是富Gd氧化物、富Co相或ζ-CoAl相;在1173K退火的x=4的样品含有较多的第二相,它是具有六方CaCu5型结构的1:5相;x=5的退火样品是三相,主相是1:5相,第二相和第三相分别是2:17相和具有CsCl结构的ζ-CoAl相,提高退火温度,样品的2:17相含量增多,1:5相相应减少;在室温以下,样品(x≤4)的自发磁化强度随温度降低而减小,在74和65K附近,x=4的两相样品和单相样品的自发磁化强度M0先后降为零,但x=5的样品磁距随温度降低而增大.

参考文献

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