Fe-Ga合金薄带的显微组织及磁致伸缩性能

Microstructure and Magnetostrictive Properties of Melt-spun Fe-Ga Alloy Ribbons

采用熔体快淬的方法制备了成分分别为Fe100-xGax(x=17、18、21)的合金薄带,研究了不同辊速(分别为12、15、20m/s)、不同成分Fe-Ga合金薄带的显微组织结构和磁致伸缩性能。试验结果表明,Fe-Ga合金的显微组织及磁致伸缩性能与合金的成分和快淬时的冷却速率密切相关,辊速为12m/s时制备的Fe83Ga17合金薄带的磁致伸缩最大,达到6.5×10-5。研究发现,所有成分的合金试样都以α-Fe的固溶体形式存在,沿薄带厚度方向晶体具有一定的取向性,大的晶格畸变和薄带的形状各异对薄带的磁致伸缩有影响。

Effects of different rolling speeds including 12,15 and 20 m/s and different compositions on the microstructure and magnetostrictive properties of Fe-Ga alloy prepared by melt-spun method have been examined. The results reveal that the microstructure and magnetostrictive properties of the alloys are closely related to the composition and cooling rate during melt-spun process. The maximum magnetostrictive properties of Fe83Ga17 reaching up to 6.5×10-5 can be obtained with a cooling rate of 12 m/s. The X-ray diffraction indicates that the microstructures of all alloy ribbons are composed of Fe solid solution. The ribbon observation reveals that the crystal along thick direction of ribbons exhibits orientation to some extent. The magnetostriction of the ribbons is related to the high lattice distortion and shape anisotropy.