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低铌铁基纳米晶合金的研究
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摘要
Finemet合金是目前具有优异软磁性能的软磁材料之一,但是合金中含有昂贵的Nb,使得Finemet具有很高的成本。为了降低合金的成本,本文利用MoV两种元素替代了合金中的Nb元素,制备了Fe73.5Si13.5B9Cu1Nb3-xMox(x=1, 2, 3)Fe73.5Si13.5B9Cu1Nb3-xVx(x=1, 2, 3)两种纳米晶非晶合金,通过X射线衍射仪(XRD)、热综合分析仪(DSC)、震动样品磁强计(VSM)等实验手段,研究了VMo两种元素对非晶合金热稳定性、晶化机制磁性能的影响。得出了如下结论:
     (1)Fe73.5Si13.5B9Cu1Nb3-xMox(x=1, 2, 3)Fe73.5Si13.5B9Cu1Nb3-xVx(x=1, 2)非晶合金的晶化过程出现两个晶化峰,其析出相分别为α-Fe(Si)相Fe-B相。添加元素VMo后合金的热稳定性降低,并且三者的热稳定性为:Nb>V>Mo。
     (2)由Avrami指数n值可知,Fe73.5Si13.5B9Cu1Nb1Mo2Fe73.5Si13.5B9Cu1Nb1V2非晶合金中α-Fe(Si)软磁相在晶化初期为扩散控制的二维三维形核晶粒生长的整体晶化,形核率逐渐减小,在晶化后期为一维形核生长的表面晶化,形核率近似为零。
     (3)退火后的非晶样品的磁性能较退火前有极大的改善。Fe73.5Si13.5B9Cu1Nb3-xMox(x=1, 2, 3)Fe73.5Si13.5B9Cu1Nb3-xVx(x=1, 2)两种非晶合金在不同温度下真空退火后的析出晶粒大小为13nm-21nm4nm-12nm之间,抑制晶粒长大能力为:V>Nb>Mo。选定合适的退火温度以获得合适的纳米晶相与非晶相配比抑制析出纳米晶粒大小,是保证非晶合金获得优异磁性能的关键。
At persent,the FINEMET alloys is one of materials with excellent soft magnetic properties,but the Nb increased the cost of the alloys.In order to reduce the cost of the FINMET alloys.This article studied influence of substitute element V and Mo,different heating temperature,different heating rate to the process of alloy crystallization and magnetic properties by many measure methods.such as XRD、DSC and VSM.The results as follow:
     (1)Two peaks can be observed during crystallization of Fe73.5Si13.5B9Cu1Nb3-xMox(x=1, 2, 3) and Fe73.5Si13.5B9Cu1Nb3-xVx(x=1, 2) amorphous alloys,the two crystallization stages are related to the appearance ofα-Fe(Si) phase and Fe-B phase,separately.The thermostability of the alloy was deteriorated as a consequence of Nb substituted by Mo and V,and thermostability rank order was Nb>V>Mo.
     (2) Due to the average value of Avrami exponent n, in the initial stage,the crystallization mechanism of the Fe73.5Si13.5B9Cu1Nb3-xMox(x=1,2,3) and Fe73.5Si13.5B9Cu1Nb1V2 alloys two and three dimensional nucleation and grain growth controlled by diffusion at decreasing nuckeation rate,in the next stage was one dimensional nucleation and grain growth at a near-zero nucleation rate are responsible for surface crystallization.
     (3)Magnetic properities were improved after annealing.With vacuum annealing at different temperature,the grain size of Fe73.5Si13.5B9Cu1Nb3-xMox(x=1, 2, 3) and Fe73.5Si13.5B9Cu1Nb3-xVx( x=1, 2) amorphous alloys were between 13nm-21nm and 4nm-12nm separately,the ability of restrain the growth of grains rank order was V>Nb>Mo,restraining grain size and controlling crystrallization fraction with changing annealing temperature was the key of getting excellent magnetic properities.
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