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采用铜模喷铸法,制备Fe100-xGax(x=15,19,23,27.5,30)合金。实验结果表明铜模喷铸有利于改善低Ga(15≤x<23)Fe100-xGax合金的磁致伸缩,却大幅降低了高Ga(23≤x≤30)Fe100-xGax合金的磁致伸缩。以Fe81Ga19和Fe72.5Ga27.5合金为例,喷铸态Fe81Ga19样品的饱和磁致伸缩比800℃淬火态提高了7%;而喷铸态Fe72.5Ga27.5样品的饱和磁致伸缩为6.1×10-5,仅是800℃淬火态的60.4%。此外,淬火态Fe72.5Ga27.5样品的饱和磁化强度为131.21A·m2·kg-1,也高于喷铸态(126.21A·m2·kg-1)。
Fe100-xGax (x = 15, 19, 23, 27.5, 30) alloys were prepared by copper die casting. The experimental results show that copper mold casting is beneficial to improve the magnetostriction of low-Ga (15≤x <23) Fe100-xGax alloys, but significantly reduce the magnetostriction of high-Ga (23≤x≤30) Fe100-xGax alloys. Taking Fe81Ga19 and Fe72.5Ga27.5 as an example, the saturation magnetostriction of the as-cast Fe81Ga19 sample increases by 7% compared with the quenched state at 800 ℃. The saturation magnetostriction of the as-cast Fe72.5Ga27.5 sample is 6.1 × 10-5, only quenched at 800 ℃ 60.4%. In addition, the saturation magnetization of the quenched Fe72.5Ga27.5 sample is 131.21A · m2 · kg-1, which is also higher than that of the as-sprayed state (126.21A · m2 · kg-1).