Structural rearrangement at medium-range and its effects on the magnetic properties and crystallization behaviors of a Fe-based amorphous alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:823

Article

Zhu, L.¹  Liu, S. N.²  Lan, S.²  Xu, Y. M.³  Li, C.³  Zheng, H.¹  Jiang, S. S.¹  Men, J. R.¹  Wang, X-L⁴  Pan, F. M.⁵  Wang, Y. G.¹ 

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 211106, Peoples R China

[2] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Herbert Gleiter Inst Nanosci, 200 Xiaolingwei Ave, Nanjing 210094, Peoples R China

[3] Nanjing Univ, Coll Engn & Appl Sci, Collaborat Innovat Ctr Adv Microstruct, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[4] City Univ Hong Kong, Dept Phys & Mat Sci, 83 Tat Chee Ave, Hong Kong 999077, Peoples R China

[5] Nanjing Univ Aeronaut & Astronaut, Coll Sci, Nanjing 211106, Peoples R China

关键词: Amorphous materials;    Atomic scale structure;    Magnetization;    Synchrotron radiation;   

DOI  :  10.1016/j.jallcom.2020.153911

来源: Elsevier

【 摘 要 】

The structure-property relationships in amorphous alloys are far from being fully understood. Here we show an unusual structural rearrangement occurring over medium-range length scale prior to crystallization for a (Fe0.5Co0.5)(72)Si4B20Nb4 amorphous alloy ribbon upon heating by in-situ synchrotron diffraction, whereas the short-range structure shows no anomaly. During the above process, local stress field generates and results in the enlargement of coercivity. This can be further supported by the magnetic force microscopy images showing an enhancement of magnetic phase contrast after annealing the sample at a temperature where the unusual structural change occurs. Moreover, the average grain size derived from the transmission electron microscopy images of the crystallized (Fe0.5Co0.5)(72)Si4B20Nb4 ribbon is much smaller than that of (Fe0.5Co0.5)(76)Si4B16Nb4, suggesting the slow crystallization kinetics caused by the local stress field. This work highlights the role of medium-range order in determining the properties of amorphous alloys. (C) 2020 Elsevier B.V. All rights reserved.

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