High Temperature Properties of Highly Electrical Resistive (Fe0.81Co0.19)(84)Ta9B7 Alloy Cast in Air

作者：Turgut Z^*; Lucas M S; Michel E; Semiatin S L; Horwath J C

来源：IEEE Transactions on Magnetics, 2016, 52(2): 2000305.

DOI：10.1109/TMAG.2015.2480738

• Amorphous alloys
• crystallization
• electrical resistivity
• Fe-Co alloys
• soft magnetic materials

This paper presents results from in situ X-ray diffraction (XRD), electrical resistivity, and magnetic measurements on an air-cast, amorphous (Fe0.81Co0.19)(84)Ta9B7 alloy as a function of temperature. The high temperature magnetic measurements revealed that the Curie temperature of the amorphous phase is 327 degrees C and crystallization begins at 483 degrees C. The crystallite sizes determined from the Scherrer analysis of XRD data increased from 13.4 nm at 525 degrees C to 31.3 nm at 600 degrees C. XRD data also indicated the presence of two minor metastable phases; one in an as-cast state, which decomposes at temperatures above 400 degrees C and a second one that starts forming at temperatures above 400 degrees C and decomposes before the temperature reaches 525 degrees C. Permeability increased with temperature first, showing a peak value at 125 degrees C and steadily decreased afterward to values comparable with those of dust cores. Coercivity increased significantly above 200 degrees C and a peak value of 130 Oe was observed at similar to 400 degrees C. In the as-cast state, the material exhibited an electrical resistivity value of 180 mu Omega-cm, which was significantly reduced after crystallization. The material also exhibited a small negative temperature coefficient of resistivity.

• 出版日期2016-2