摘要:
通过区熔定向凝固法,生长出[001]易磁化方向与晶体轴向之间存在不同取向差的Fe81Ga19合金单晶体和Fe81Ga19合金多晶体.极图测试结果显示,Fe81Ga19合金单晶体的[001]方向与轴向取向差分别为12°,5°和3°.采用电阻应变片法测定相应磁致伸缩应变,与外加磁场方向平行的轴向磁致伸缩应变分别为254×10-6,271×10-6和291×10-6.由劳埃法确定并切取[001]取向Fe81Ga19合金单晶体,磁致伸缩应变达到312×10-6.采用背散射取向分析方法（EBSD）,确定了定向生长Fe81Ga19合金取向多晶体不同晶粒[001]易磁化方向与晶体轴向之间取向差,其分别为18.4°,15.2°和14.8°,轴向磁致伸缩应变分别为180×10-6,230×10-6和235×10-6.
Abstract:
Fe81Ga19 single crystals and polycrystals with different orientations are prepared by zone melting directional solidification. Pole figures show that the deviation degrees between [001] orientation and axis are 12°, 5° and 3°, and the in corresponding axial magnetostrictions parallel to external magnetic field are 254×10-6, 271×10-6 and 291×10-6. The[001]orientation single crystal is determined by back-reflection Laue, and the magnetostriction is 312×10-6. The results reveal the relationship between crystallographic orientation and magnetostriction, and the increase of magnetostrictions with deviation degree decreasing. The deviation degrees between [001]orientation and axis of polycrystals are determined by Electron Backscattered Diffraction to be 18.4°, 15.2° and 14.8°, and thir corresponding magnetostrictions are 180×10-6m, 230×10-6 and 235×10-6.
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