反铁磁Fe_(1-x)Mn_x(0．30≤x≤0．55)合金的磁致伸缩

MAGNETOSTRICTION IN ANTIFERROMAGNETIC Fe_(1-x)Mn_x(0.30≤x≤0.55) ALLOYS

采用真空感应熔炼法,制备Fe_(1-x)Mn_x(x=0.30,0.35,0.40,0.50,0.55(原子分数))合金,在1000℃保温24h,炉冷至室温.研究了不同结构Fe_(1-x)Mn_x合金样品的室温磁致伸缩性能.结果表明,x(?)0.40时,Fe_(1-x)Mn_x合金样品为γ+ε双相结构,并且ε相体积分数随Mn含量增加而减小,磁致伸缩性能较差;x>0.40时,合金样品为单一的γ相,具有良好的磁致伸缩性能.Fe_(0.50)Mn_(0.50)合金样品在1.9T磁场中的磁致伸缩可达8.73×10^(-4).

Antiferromagnetic Fe1-xMnx（x=0.30, 0.35, 0.40, 0.50, 0.55 （atomic fraction）） alloys were prepared by induction melting method. A homogenization for 24 h at 1000℃ was carried out on the samples, followed by furnace cooling to room temperature. The microstructures and magnetostrictive properties of Fe1-xMnx samples were investigated. It is found that when x 〈0.40, Fe1-xMnx alloys consist of fcc γ and hcp ε phases with poor magnetostrictive property, and the volume proportion of ε phase decreases with the increase of Mn content. When x 〉0.40, the samples are single fcc 7 phase and possess much better magnetostrictive performance. The magnetostriction of Fe0.50Mn0.50 sample reaches 8.73×10^-4 in 1.9 T magnetic field.