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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 >Microstructural and magnetic behavior of an equiatomic NiCoAlFe alloy prepared by mechanical alloying
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Microstructural and magnetic behavior of an equiatomic NiCoAlFe alloy prepared by mechanical alloying

机译：机械合金化制备的等原子NiCoAlFe合金的微观结构和磁行为

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摘要

Equiatomic NiCoAlFe powder alloys were synthesized by mechanical alloying. The microstructural evolution of the mechanically alloyed powders at different times was followed with X-ray diffraction and scanning electron microscopy. The as-mechanically alloyed powders were subjected to a rapid annealing treatment at 1273 K and 1473 K during 3 min in vacuum. X-ray diffraction studies show the structure of both, the as-mechanically alloyed and annealed powders, consisted in a mixture of nanocrystalline simple phases (FCC + BCC). Crystallite size, after annealing, still remained in nanoscale. Coercivity increased due to the decrease in crystallite size and because of the defects caused by mechanical alloying in the as-mechanically alloyed samples; then coercivity decreased due to the phenomenon of random magnetic anisotropy and tended to stabilize with longer alloying times. A similar behavior was observed in annealed samples at 1273 K. However, random magnetic anisotropy was not observed after annealing at 1473 K because crystals with larger sizes were produced, and a steady increase in coercivity was observed.
机译：通过机械合金化合成了等原子的NiCoAlFe粉末合金。用X射线衍射和扫描电子显微镜观察了机械合金化粉末在不同时间的组织演变。机械状态的合金粉末在真空中经过3分钟的时间分别在1273 K和1473 K下进行了快速退火处理。 X射线衍射研究表明，机械状态下合金化和退火后的粉末均由纳米晶简单相（FCC + BCC）的混合物组成。退火后的微晶尺寸仍然保持纳米级。矫顽力的提高是由于微晶尺寸的减小以及由于机械合金化的样品中机械合金化引起的缺陷所致。然后，由于随机磁各向异性现象，矫顽力降低，并随着合金化时间的延长趋于稳定。在1273 K的退火样品中观察到类似的行为。但是，在1473 K退火后未观察到随机磁各向异性，这是因为产生了较大尺寸的晶体，并且观察到矫顽力稳定增加。

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