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Magnetic losses and mechanical properties of Fe-4 to 7.8 wt% Si rapidly quenched alloys

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7 Author(s)
Fiorillo, F. ; Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy ; Ferrara, E. ; Ferrando, L. ; Appino, C.
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Magnetic and mechanical properties have been investigated in Fe-4 to 7.8 wt% Si rapidly quenched and annealed ribbons. The roles played by composition and microstructure on the magnetic energy losses and the tensile stress-strain behavior have been put in evidence, by carrying out the related experiments as a function of grain size. The energy losses attain a minimum value at the 6.7% Si composition at all frequencies in the investigated range d.c.-10 kHz. The vanishing of a demonstrably important magnetostriction-related coercivity contribution, which can be singled out in these stress-free samples, is recognized as the leading cause of loss minimization. The composition and grain size dependent stress-strain curves are found to obey a Hall-Petch law for the yield stress. While the elastic limit increases with the Si content, a decrease of the strain at fracture is correspondingly observed

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Magnetics, IEEE Transactions on  (Volume:33 ,  Issue: 5 )