ROLE OF MATERIAL PURITY ON THE STRUCTURAL AND MAGNETIC-PROPERTIES OF RAPIDLY SOLIDIFIED FESI 6.5 WT-PERCENT ALLOYS

Citation
E. Ferrara et al., ROLE OF MATERIAL PURITY ON THE STRUCTURAL AND MAGNETIC-PROPERTIES OF RAPIDLY SOLIDIFIED FESI 6.5 WT-PERCENT ALLOYS, Journal of magnetism and magnetic materials, 133(1-3), 1994, pp. 366-370
Citations number
11
Categorie Soggetti
Material Science","Physics, Condensed Matter
ISSN journal
03048853
Volume
133
Issue
1-3
Year of publication
1994
Pages
366 - 370
Database
ISI
SICI code
0304-8853(1994)133:1-3<366:ROMPOT>2.0.ZU;2-U
Abstract
A study has been made on the structural and magnetic properties of rap idly quenched FeSi 6.5 wt% alloys, obtained from high purity (HP) and commercial purity (CP) master alloys and characterised upon a range of annealing treatments. Superior magnetic behavior is exhibited by the HP alloys after annealing, which correlates with enhanced growth of a favourable cube-on-face crystallographic texture. As suggested by meta llographic analysis, a surface energy mechanism appears to control the evolution of such texture, with a critical role being played by solut e oxygen. Mechanical strength and ductility also appear improved in th e HP samples. Substantial loss of Si and weakening of the texture are however observed after high temperature annealing (T > 1200-degrees-C) , with ensuing deterioration of the material soft magnetic properties. It is concluded that optimum dc and high frequency magnetic behavior of HP and CP alloy ribbons requires annealing treatments at temperatur es around 1100-1150-degrees-C, where the achieved material structure p rovides minimum losses and maximum permeability and the high Si concen tration of the as-quenched material is retained.