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采用熔融玻璃净化与循环过热相结合的方法,制备了过冷度分别为198 K和270 K的(Fe81Ga19)90B10合金,并对合金的组织和磁致伸缩性能进行了研究。结果表明,随着过冷度增加,合金的晶粒尺寸由50μm逐渐增大到100μm左右,晶界逐渐变细;(Fe81Ga19)90B10合金由于在低角度附近存在有序DO3相,导致其磁致伸缩值增加较小,由60×10-6增至80×10-6。在合金凝固过程中施加垂直磁场后晶粒尺寸变大,合金内部富B相及富Ga相的析出量增加,但磁致伸缩性能较加磁场前变化不大,达到85×10-6。(Fe81Ga19)90B10合金沿<110>方向具有一定的择优取向,因偏离<100>易磁化方向,磁致伸缩系数较低。
The (Fe81Ga19) 90B10 alloy with undercooling of 198 K and 270 K was prepared by the combination of glass melting and overheating. The microstructure and magnetostrictive properties of the alloy were investigated. The results show that as the undercooling increases, the grain size of the alloy gradually increases from 50μm to 100μm, and the grain boundaries become thinner. Due to the presence of ordered DO3 phase in the (Fe81Ga19) 90B10 alloy, Telescopic value increased slightly smaller, from 60 × 10-6 to 80 × 10-6. When the perpendicular magnetic field was applied during solidification, the grain size became larger and the amount of B-rich phase and Ga-rich phase increased. However, the magnetostrictive properties did not change much before the magnetic field reached 85 × 10-6. (Fe81Ga19) 90B10 alloy has a preferred orientation along the <110> direction, with a lower magnetostriction coefficient due to deviations from the <100> direction of easy magnetization.