〈533〉轴向取向稀土超磁致伸缩合金棒的制备与性能

Preparation and Properties of Rare Earth-iron Giant Magnetostrictive Material with 〈533〉 Axial Alignment

利用非自耗真空电弧熔炼炉,通过恰当控制熔炼温度和热流方向,成功生长了具有〈533〉轴向取向的多晶稀土-铁系超磁致伸缩合金棒材。对其磁致伸缩性能测试结果表明,所制备的棒材具有较高的磁致伸缩应变,在0MPa压应力、400 kA.m-1的磁场下,其轴向饱和磁致伸缩系数λ//达1045×10-6,饱和磁致伸缩系数λS为856×10-6。X射线衍射结果表明,该材料在轴向主要有(533)强衍射峰,同时还具有(311),(110)等弱峰;径向则有(110),(220),(311),(511)等衍射峰,但各峰强度均很弱,证明该方向上的取向性不如轴向。另外,本实验还对超磁致伸缩材料的磁滞回线进行了测试分析。

Tb0.3Dy0.TFe2 alloys with （533〉 axial alignment were prepared by an electric arc melting- directional solidification technique and controlling melting temperature and heat flux orientation. The results shows that Tb0.3Dy0.7Fe2 alloys have a higher magnetostriction, and the magnetostriction λ// and λs arrive 1045 ×10^-6 , 856×10^-6 respectively under 0MPa stress and 400 kA · m^-1 magnetic field. X-rays diffraction shows that there is （533） strongest peak for the axial orientation of alloy rod with （311）, （110） weak peaks, and there are （110）, （220）, （311）, （511） peaks which are all weaker for the transverse-cross orientation. Moreover, the hysteresis loop of the alloy was also tested and discussed.