Softening and good ductility for nanocrystal-dispersed amorphous Fe-Co-B alloys with high saturation magnetization above 1.7 T
Softening and good ductility for nanocrystal-dispersed amorphous Fe-Co-B alloys with high saturation magnetization above 1.7 T
复制标题
DOI：
10.1016/j.jallcom.2015.10.066
复制
发表时间：
2016-02-05
影响因子：
6.2
通讯作者：
Al-Marzouki, F.
中科院分区：
文献类型：
--
作者：
Han, Y.;Inoue, A.;Al-Marzouki, F.
采用快淬技术制备了Fe_（80-x）Co_（20）B_x（x = 12-15 at%）合金薄带，其组成为单一bcc相（12%B）、非晶+bcc-Fe（Co）混合相（13%B）和非晶单相（14%B和15%B）。结果表明，所有含非晶相的合金薄带在快淬态和退火后均表现出良好的弯曲塑性，并在退火过程中析出了纳米尺度的bcc-Fe（Co）相。硬度较低的非晶+bcc-Fe（Co）相合金在硬度压痕附近出现了大量的微裂纹，并出现了明显的滑移台阶痕迹。纳米晶状态下硬度的降低和延展性的保持被解释为源于微裂纹诱导的软化现象。纳米晶合金还表现出良好的软磁性能，具有高于1.7T的高饱和磁化强度，并具有约20 A/m的低矫顽力。含有纳米bcc-Fe（Co）相的非晶合金良好的弯曲塑性和微裂纹诱导软化被认为是铁基纳米晶软磁合金漫长发展历史的第一个证据。具有高饱和磁化强度的韧性铁基纳米晶合金的发现对纳米晶磁性材料的进一步推广具有重要意义。(C)2015爱思唯尔B. V.保留所有权利。
Fe80-xCo20Bx (x = 12-15 at%) alloy ribbons consisting of single bcc phase (12%B), amorphous plus bcc-Fe(Co) mixed phases (13%B) and amorphous single phase (14%B and 15%B) were synthesized by the melt-spinning technique. It is noticed that all the alloy ribbons containing amorphous phase exhibit good bending ductility in the as-spun state and even after annealing which leads to the precipitation of nanoscale bcc-Fe(Co) phase. The amorphous plus bcc-Fe(Co) phase alloys with lower hardness exhibited a number of microcracks in the region near the hardness indentation trace, in addition to distinct slip step markings. The decrease in hardness and the maintenance of ductility in the nanocrystalline state are interpreted to originate from microcrack-induced softening phenomenon. The nanocrystalline alloys also exhibit good soft magnetic properties with high saturation magnetization above 1.7 T in combination with low coercivity of about 20 A/m. The good bending ductility as well as the microcrack-induced softening for the amorphous alloys including nanoscale bcc-Fe(Co) phase is believed to be the first evidence in the long development history of Fe-based nanocrystalline soft magnetic alloys. The finding of the ductile Fe-based nanocrystalline alloys with high saturation magnetization is encouraging for further extension of nanocrystalline magnetic materials. (C) 2015 Elsevier B.V. All rights reserved.