铜模喷铸Fe_(100-x)Ga_x(15≤x≤30)合金的磁致伸缩

Magnetostriction of Fe_(100-x)Ga_x(15≤x≤30) Alloys Prepared by Copper Mold Injection Casting

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 the technique of copper mold injection casting. It is found that this method could improve the magnetostriction of Fel00_xGax alloys when 15≤x〈23, but deteriorate the magnetostriction of Fe100-xGax alloys when 23 ≤x≤30. Take Fe81Ga19 and Fe72.5Ga27.5 alloys as example, the saturation magnetostriction of the injection-cast Fe81Ga19 was 7% larger than that of the sample quenched from 800℃; however, the saturation magnetostriction of the injection-cast Fe72.sGa275 was 6.1 × 10^-5, which was only 60.4% of the value measured from the corresponding sample quenched from 800 ℃. In addition, the saturation magnetization of the quenched Fe72.sGa27.5 was 131.21 A·m^2·kg^-1, which was also higher than that of the injection-cast one （126.21 A·m^2·kg^-1）.