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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of boron on structural and magnetic properties of the Fe(60)Al_(40) system prepared by mechanical alloying
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Effect of boron on structural and magnetic properties of the Fe(60)Al_(40) system prepared by mechanical alloying

机译：硼对机械合金化制备的Fe（60）Al_（40）体系的结构和磁性的影响

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摘要

A new nanostructured system, FeAlB, with high content of boron, was prepared by mechanical alloying in a high-energy ball mill. X-ray diffraction (XRD) and ~(37)Fe Mossbauer spectroscopy were used to study structural and magnetic properties, respectively. Two crystalline phases were found, a majority one corresponding to an FeAl bcc phase and another in low proportion, corresponding to an Fe_2B phase type which appears due to the presence of boron. Such a phase is also well observed from Mossbauer spectra. An anisotropic model was applied to fit X-ray patterns, giving evidence of different shapes of the nanocrystalline grains in agreement with the milling process involving both confinement and atomic diffusion. Also it was possible to postulate from both X-ray diffraction and Mossbauer spectrometry that there appears an additional contribution at low hyperfine fields attributed to grain boundaries. This contribution increases as both milling time and boron composition increases.
机译：通过在高能球磨机中机械合金化制备了一种新的纳米结构系统，即高硼含量的FeAlB。 X射线衍射（XRD）和〜（37）Fe Mossbauer光谱分别用于研究结构和磁性。发现了两个结晶相，大多数结晶相对应于FeAl bcc相，另一结晶相比例低，对应于由于存在硼而出现的Fe_2B相类型。从莫斯鲍尔光谱也可以很好地观察到这种相。应用各向异性模型拟合X射线图，从而给出纳米晶粒不同形状的证据，这与涉及限制和原子扩散的铣削过程一致。同样有可能从X射线衍射和Mossbauer光谱中推测出，在归因于晶界的低超精细场中似乎还有其他贡献。随着研磨时间和硼组成的增加，该贡献增加。

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