点击次数：

所属单位：材料科学与技术学院

发表刊物：JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

关键字：Structural relaxation Short-range order Defects Nanocrystallization Soft magnetic properties

摘要：The evolution of local structure and defects in the Fe81Si4B10P4Cu1 amorphous alloy during the structural relaxation has been investigated by Mossbauer spectroscopy, positron annihilation lifetime spectroscopy and transmission electron microscopy to explore their effects on magnetic properties of the nanocrystalline. The atomic rearrangements at the early stage of the structural relaxation cause the density increase of the amorphous matrix, but the subsequent atomic rearrangements contribute to the transformation of Fe3B-like atomic arrangements to FeB-like ones with the temperature increasing. As the structural relaxation processes, the released Fe atoms both from Fe3B- and Fe3P-like atomic arrangements result in the formation of new Fe clusters and the increase of Fe-Fe coordination number in the existing Fe clusters and the nucleation sites for alpha-Fe gradually increase, both of which promote the crystallization. However, the homogeneity of amorphous matrix will be finally destroyed under excessive relaxation temperature, which coarsens nanograins during the crystallization instead. Therefore, soft magnetic properties of the Fe81Si4B10P4Cu1 nanocrystalline alloy can be improved by pre-annealing the amorphous precursor at an appropriate temperature due to the atomic level structural optimization. (C) 2018 Elsevier B.V. All rights reserved.

ISSN号：0304-8853

是否译文：否

发表时间：2018-06-15

合写作者：Cao, C. C.,朱力,孟洋,Zhai, X. B.

通讯作者：王寅岗