论文部分内容阅读
以(Fe81Ga19)99B1合金为对象,研究了不同热处理条件下合金析出相形貌和大小分布特征及其对力学性能和磁致伸缩性能的影响。结果表明,在1000℃下保温5 min~4 h的条件范围内,合金中细小富Ga析出相的平均尺寸随保温时间的延长由铸态的约1.2μm增加到约3.6μm;保温时间从4 h延长至12 h,析出相平均尺寸基本保持不变;与铸态试样相比,1000℃保温4 h后淬火态试样的维氏硬度下降了28.0%,变形抗力下降了11.9%(工程应变0.18时),表明析出相的粗化使合金呈现出软化特征;1000℃保温5 min后淬火试样的磁致伸缩系数比铸态试样提高51.2%,1000℃保温时间≥4 h淬火试样的磁致伸缩系数比1000℃保温5 min试样进一步提高了30.0%以上,即淬火保温时间延长导致析出相的粗化有利于合金磁致伸缩性能的提高。
The (Fe81Ga19) 99B1 alloy was investigated for the morphology and size distribution of the precipitates and their effects on the mechanical properties and magnetostrictive properties under different heat treatment conditions. The results show that the average size of fine Ga-rich precipitates increases from about 1.2μm to about 3.6μm with the increase of holding time at 1000 ℃ for 5 min to 4 h. The holding time increases from 4 h extended to 12 h, the average size of the precipitated phase remained unchanged. Compared with the as-cast samples, the Vickers hardness of the quenched samples decreased by 28.0% and the deformation resistance decreased by 11.9% after kept at 1000 ℃ for 4 h Strain 0.18), indicating that the precipitated phase roughening the alloy softening characteristics showed; 5 min after 1000 ℃ quenching sample magnetostriction coefficient than the as-cast sample increased 51.2%, 1000 ℃ holding time ≥ 4 h quenching test Magnetostrictive coefficient of the sample than the 1000 ℃ incubated 5 min sample further increased by 30.0% or more, that quenching holding time lead to precipitation of coarse coarsening conducive to the improvement of magnetostrictive properties.