TAILIEUCHUNG - Báo cáo " Influence of cooling rate on the properties of Fe73.5Si13.5B9Nb3Au1 ribbons "

ribbons have been prepared by rapid cooling on a single copper wheel with different speeds of wheel of 10, 20, 30, and 40 m/s. The as-spun samples are amorphous. Upon annealing, the nanocrystalline phases are formed. Increasing the cooling rate leads to thinner ribbons, higher crystallization activation energy and crystallization volume fraction of the α-Fe(Si) phase, slightly increasing Curie temperature and soft magnetic properties of annealed ribbons. The large magnetic entropy change is observed for sample with v = 30 m/s. The mechanisms of the effects have been discussed. . | VNU Journal of Science Mathematics - Physics 24 2008 189-195 Influence of cooling rate on the properties of ribbons . Gam . Hai . Vu . Luong N. Chau Center for Materials Science College of Science VNU 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Received 14 November 2008 Abstract. ribbons have been prepared by rapid cooling on a single copper wheel with different speeds of wheel of 10 20 30 and 40 m s. The as-spun samples are amorphous. Upon annealing the nanocrystalline phases are formed. Increasing the cooling rate leads to thinner ribbons higher crystallization activation energy and crystallization volume fraction of the a-Fe Si phase slightly increasing Curie temperature and soft magnetic properties of annealed ribbons. The large magnetic entropy change is observed for sample with v 30 m s. The mechanisms of the effects have been discussed. 1. Introduction Recently nanocrystalline soft magnetic materials attract significant interest both for fundamental research as well as production in moderately large scale. Among them most attention is paid to nanocrystalline ferromagnet Finemet which has been discovered by Yoshizawa and co-workers in 1988 at Hitachi Metals in Japan 1 . Nanocrystalline Fe-based alloys are almost magnetically isotropic due to ultrafine grain structure with average grain size less than 20 nm . less than domain width therefore the movement of domain wall is not pinned at grain boundary 2 . When exchange interaction length is much larger than the average grain size the macroscopic anisotropy averages out to given an effective anisotropy K which is approximately three orders of magnitude smaller. In addition it is considered that the negative saturation magnetostriction Xs of the high Si nanocrystalline phase is closely counter balanced in volume terms by large positive Xs for the glassy matrix so that the net Xs is very small. These two factors contribute to the .

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