Effects of minor precipitation of large size crystals on magnetic properties of Fe-Co-Si-B-P-Cu alloy
Effects of minor precipitation of large size crystals on magnetic properties of Fe-Co-Si-B-P-Cu alloy
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DOI：
10.1016/j.jallcom.2017.03.193
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发表时间：
2017-06
影响因子：
6.2
通讯作者：
Yan Zhang;Parmanand Sharma;A. Makino
中科院分区：
文献类型：
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作者：
Yan Zhang;Parmanand Sharma;A. Makino
纳米晶Fe_（81.3）Co_（4Si）_（0.5）B_（9.5）P_（4Cu）_（0.7）合金表现出较低的矫顽力（Hc<10 A/m），但Co含量从4at.%增加到5at.%（Fe_（81.3）Co_（55）Si_（0.5）B_（8.5）P_（44）Cu_（0.7））的加入使Hc值急剧增加（>60 A/m）。在结构方面，两种合金在淬火态下表现出相似的X射线衍射图谱（即X射线非晶）。与低Co含量的合金相似，高Co含量的合金可以获得由bcc结构的Fe-Co相组成的精细纳米晶结构，但在淬火态存在极少量的100 nm以上的大尺寸晶体，提高了合金的Hc。淬火态大量的bcc Fe（-Co）核（~ 2-5 nm）导致最佳退火后的高磁通密度（Bs）。在该系统中，有可能获得1.88- 1.90T的aB，但这是以增加Hc为代价的。
Nanocrystalline Fe81.3Co4Si0.5B9.5P4Cu0.7alloy shows low coercivity (Hc<10 A/m), but a minor increase in Co from 4 to 5 at.% (Fe81.3Co5Si0.5B8.5P4Cu0.7) results in a drastic increase inHc(>60 A/m). In terms of structure both the alloys in as-quenched state exhibit similar X-ray diffraction patterns (i.e. X-ray amorphous). Similar to low concentration of Co in the alloy, it is possible to realize a fine nanocrystalline structure made from bcc Fe-Co phase for higher concentration of Co. However, existence of a very few large sized crystals (above 100 nm) in as-quenched state enhances theHc. A large numbers of bcc Fe(-Co) nuclei (∼2–5 nm) in as-quenched state results in a high magnetic flux density (Bs) after optimum annealing. It is possible to obtain aBsof 1.88–1.90 T in this system but it is at the cost of an increase inHc.