采用悬浮区熔法, 加入籽晶控制生长取向, 以4 mm/h的生长速度, 制备了轴向<001>择优取向的 Fe81Ga19单晶. 极图测试结果发现, 采用偏离轴向<001>方向约5o的籽晶生长得到的单晶, 生长始端和生长末端轴向取向分别偏离<001>取向5o和4o, 上下取向差仅为1o. 另一单晶采用轴向<001>取向籽晶生长得到, 当施加60 MPa压力时, 饱和磁致伸缩性能达到0.0324%. 测试了<100>, <110>和<111> 取向单晶的初始磁化曲线, 利用初始磁化曲线, 计算得出Fe81Ga19单晶的磁晶各向异性常数值K1和K2, 分别为1.3×104和-2.6×104 J/m3.
The Fe81Ga19 single crystals were grown in a floating zone melting furnace at a growth rate of 4 mm/h by using a seed crystal. A single crystal was grown by using the seed crystal oriented 5o from the <001> orientation. Pole figure tests were taken at different parts of the single crystal and showed that the start and end parts' axial orientations were 5o and 4o from the <001> orientation, respectively. Another single crystal was grown by using the seed crystal oriented <001> orientation. Magnetostrictive properties along the axis of the crystals λ// were measured for the single crystal, and the saturated magnetostriction λ// up to 0.0324% was achieved under the pre-stress of 60 MPa. Initial magnetization curves were measured in single crystals along <100>, <110> and <111> axis, respectively. From the magnetization curves, magnetocrystalline anisotropy constants of Fe81Ga19 alloys were calculated, and the values of K1 and K2 were 1.3×104 and -2.6×104 J/m3, respectively.
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