用GaIn合金冷却液体作为冷却介质，将Fe81Ga19熔体快淬制备出具有晶粒沿棒径向生长组织的合金棒。利用X射线极图反射法判定棒轴向取向为[110]方向。通过热分析和XRD测试结果，结合相图分析可知合金的相结构为A2无序体心立方结构相，热处理未改变合金的A2相结构，均在690℃附近发生了A2相的居里转变。合金棒材在无轴向压力条件下获得饱和磁致伸缩值为66ppm，在加压条件下磁致伸缩出现明显的压力效应，从10MPa 到50MPa的测量压力范围内，随压力增大，饱和磁致伸缩值增加，在50MPa压应力作用下饱和磁致伸缩值达到115ppm。
Fe81Ga19 magnetostrictive alloy rods were prepared by quenching from melt into the GaIn cooling media. The optical microscopy results showed that fine columnar crystalline distributing in the transverse and longitudinal sections of Fe81Ga19 rod. The [110] texture along the rod was detected from X-ray pole figure. Combining thermal analysis (DSC、TG) and x-ray diffraction patterns (XRD), it could be determined that the alloy was mainly comprised of a disordered bcc A2 phase, which kept the same after heat treatment. A magnetic transition was monitored at about 690℃ for both the as-solidified and heat treated samples, consistent with the curie temperature of A2 phase. The saturation magnetostriction reached 66ppm without a pre-stress. The enhanced magnetostriction was obviously observed under a pre-stress. Magnetostriction rose with the increasing compressive stress in the experimental range from 10MPa to 50MPa. The saturation magnetostriction achieved up to 115ppm under a 50MPa compressive pre-stress.
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