Improvement of magnetic properties, microstructure and magnetic structure of Fe73.5Cu1Nb3Si15.5B7 nanocrystalline alloys by two-step annealing process
Improvement of magnetic properties, microstructure and magnetic structure of Fe73.5Cu1Nb3Si15.5B7 nanocrystalline alloys by two-step annealing process
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DOI：
10.1007/s10854-015-4216-4
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Yabin Han;Anding Wang;Aina He;Chuntao Chang;Fushan Li;Xin-min Wang
中科院分区：
文献类型：
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作者：
Yabin Han;Anding Wang;Aina He;Chuntao Chang;Fushan Li;Xin-min Wang
采用常规的一步退火工艺和两步退火工艺制备了FeCuNbSiB纳米晶合金。结果表明，两步退火工艺能有效地改善软磁性能，优化组织。通过分别控制Cu团簇的形成和进一步优化纳米晶结构，在400C处理和560C纳米化1h的样品中形成了晶粒度为13 nm的体心立方α-Fe，样品具有良好的磁性能，如较低的矫顽力0.7A/m，较高的初始磁导率9.16×10，0.7T和400 Hz的较低的铁损0.18W/kg，0.7T和1 kHz的0.5W/kg。研究了不同退火热处理过程中的显微组织和磁结构的演变。系统地研究了两种不同晶化过程中磁性能、磁结构和微观结构变化之间的关系。
FeCuNbSiB nanocrystalline alloys were prepared by using conventional one-step annealing process and two-step annealing process. It was found that two-step annealing process can effectively improve soft magnetic properties and optimize microstructure. By separately controlling the formation of Cu clusters and further optimize the nanocrystalline structure, Bcc α-Fe with the grain size of 13 nm is formed in samples pretreated at 400 C and nanocrystallized at 560 C for 1 h. The samples exhibit excellent magnetic properties, such as lower coercive force of 0.7 A/m, higher initial permeability of 9.16× 10, lower core loss of 0.18 W/kg at 0.7 T and 400 Hz, and 0.5 W/kg at 0.7 T and 1 kHz, respectively. The microstructure and magnetic structure evolution during different annealing processes were investigated. Correlation among the magnetic properties, magnetic structures and the microstructures changes in two different crystallization processes was studied systematically.