快淬和退火对Fe83 Ga17 Ce0．8合金结构和磁致伸缩性能的影响∗

摘要

采用电弧熔炼法制备了稀土Ce掺杂的 Fe83 Ga17 Ce0．8铸态合金,然后对其进行快淬处理,获得Fe83 Ga17 Ce0．8快淬态合金,最后对 Fe83 Ga17 Ce0．8快淬态合金在1223 K下进行退火热处理5 h.用 X 射线衍射(XRD)、扫描电镜及能谱仪(SEM/EDS)和磁致伸缩测试方法研究了快淬和退火对合金结构和磁致伸缩性能的影响.结果表明,Fe83 Ga17 Ce0．8铸态合金由 bcc结构的Fe(Ga)相和少量的 CeFe2第二相组成.Fe83 Ga17 Ce0．8快淬态合金除了含有大量的 Fe(Ga)相和少量的CeFe2相外,合金中还出现了非对称 DO3结构的 Fe3 Ga相.Fe83 Ga17 Ce0．8快淬态合金经退火热处理后,合金中的CeFe2相转化为贫稀土 Ce2 Fe17相.在外磁场为557 kA/m时,Fe83 Ga17 Ce0．8快淬态合金的磁致伸缩系数(3．82×10－4)明显大于铸态合金(3．56×10－4)和退火态合金(1．82×10－4)的磁致伸缩系数.%Rare earth Ce doped Fe83 Ga17 Ce0.8 as-cast alloy was prepared by non-consumable vacuum arc melting furnace using high purity elements under a protective argon atmosphere and then rapidly quenched at 6 m/s.Fi-nally,the Fe83 Ga17 Ce0.8 quenched alloy was annealed at 1 223 K for 5 h.The effects of rapid quenching and an-nealing on structure and magnetostriction property of Fe83 Ga17 Ce0.8 alloys were investigated by means of X-ray diffraction (XRD),scanning electron microscopy (SEM),energy dispersive spectrometry (EDS)and magneto-striction measurements,respectively.The results showed that the Fe83 Ga17 Ce0.8 as-cast alloy was composed of the Fe(Ga)solid solution phase with bcc structure and a small amount of CeFe2 secondary phase.However,the Fe83 Ga17 Ce0.8 quenched alloy was mainly composed of the Fe(Ga)solid solution phase with bcc structure,a small amount of CeFe2 and unsymmetrical Fe3 Ga phase with DO3 structure.After annealing,the CeFe2 phase of quenched alloy was conversed into Ce-poor rare earth phase of Ce2 Fe17 .The magnetostriction coefficient of quenched Fe83Ga17Ce0.8 alloy (3.82×10-4)was larger than that of the as-cast Fe83Ga17Ce0.8 alloy (3.56×10-4) and annealed Fe83Ga17Ce0.8 alloy (1.82×10-4)at the magnetic field of 557 kA/m.