Title :
Magnetic properties of (Fe,Co)-B-Al-Nb alloys with ultrafine grain structure
Author :
Cho, Y.S. ; Kim, Y.B. ; Kim, C.S. ; Lee, K.H. ; Kim, T.K.
Author_Institution :
Korea Res. Inst. of Stand. & Sci., Taejon, South Korea
fDate :
11/1/1994 12:00:00 AM
Abstract :
The magnetic properties of (Fe,Co)-B-Al-Nb alloys prepared by rapid solidification process have been studied for the development of a new type Fe-based nanocrystalline alloy. Microstructure composed of ultrafine bcc Fe(Co) has been obtained directly from the rapid solidification by adding 10 at.% Al to (Fe0.85Co0.15 )80B20 alloy. Furthermore, the addition of 2~6 at% Nb to (Fe0.85Co0.15)70B20 Al10 alloy decreases the saturation magnetostriction below 5 ppm. Heat treatment of as-prepared alloys further improves its soft magnetic properties in high frequency range. (Fe0.85Co 0.15)70B18Al10Nb2 alloy annealed at 400°C for 1 h shows the microstructure composed of ultrafine grains of about 8 nm and the most improved magnetic properties among the prepared alloys
Keywords :
alloying additions; boron alloys; cobalt alloys; crystal microstructure; ferromagnetic materials; grain size; iron alloys; magnetostriction; nanostructured materials; niobium alloys; rapid solidification; soft magnetic materials; (Fe,Co)-B-Al-Nb alloys; (FeCo)BAlNb; 1 h; 400 C; heat treatment; magnetic properties; microstructure; nanocrystalline alloy; rapid solidification process; saturation magnetostriction; soft magnetic properties; ultrafine grain structure; ultrafine grains; Aluminum alloys; Annealing; Cobalt alloys; Frequency; Heat treatment; Iron alloys; Magnetic properties; Magnetostriction; Microstructure; Niobium alloys;
Journal_Title :
Magnetics, IEEE Transactions on
