High temperature soft magnetic properties of (Fe Co1−)73.5Cu1Mo3Si13.5B9 (x=0.5,1) alloys

Autor: Yun-yun Jia, Jia Wang, Rui-min Shi, Zhi Wang, Zhuan-ping Wen
Rok vydání: 2013
Předmět:
Zdroj: Journal of Magnetism and Magnetic Materials. 328:62-65
ISSN: 0304-8853
DOI: 10.1016/j.jmmm.2012.09.068
Popis: The microstructure and high-temperature soft magnetic properties of amorphous and nanocrystalline (FexCo1−x)73.5Cu1Mo3Si13.5B9 (x=0.5,1) alloys were investigated. By substituting Co for Fe partially, the onset temperature of primary crystallization, T x 1 o , for precipitating α-FeCo soft magnetic phase was decreased from 505 to 460 °C, while the Curie temperature of amorphous alloy, T C A ⁎ , was enhanced from 320 to 455 °C. XRD patterns showed that a single α-FeCo crystalline phase with grain size about 16 nm was precipitated from amorphous matrix for (Fe0.5Co0.5)73.5Cu1Mo3Si13.5B9 alloy annealed between 460 and 580 °C. Although, the room temperature permeability of nanocrystalline (Fe0.5Co0.5)73.5Cu1Mo3Si13.5B9 alloy was not as high as that of nanocrystalline Fe73.5Cu1Mo3Si13.5B9 alloy due to a large saturation magnetostriction (>40 ppm), the improved high-temperature magnetic softness was observed for nanocrystalline (Fe0.5Co0.5)73.5Cu1Mo3Si13.5B9 alloy. The initial permeability about 1000 at 10 KHz can be maintained up to 600 °C, exhibiting a good thermal stability and higher initial permeability at elevated temperatures which is superior to that of Co-free Fe73.5Cu1Mo3Si13.5B9 alloy. The origin of this magnetic softness at elevated temperature was analyzed in terms of Hernando's enhancement effect theory of Curie temperature.
Databáze: OpenAIRE
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