Soft magnetic Fe-Ni-B-Nb glassy metals
(English)Manuscript (preprint) (Other academic)
The influence of partial substitution of Fe with Ni on Fe72-xNixB24Nb4 glassy alloys with 0≥ x ≤14 on glass forming ability, thermal stability, magnetic behavior and electrical transport properties was investigated systematically. Ni substituted alloys were found with improved glass forming ability and glassy rods of at least half millimeter were fabricated for all studied compositions. Saturation magnetization decreased linearly from 133 to 115emu/g as a result of substitution for Ni concentration of 2-14%. Contrary to that Curie temperature increased linearly with substitution and as a result, highest value of 606K was achieved for 14% of Ni. As-quenched ribbon samples showed very soft magnetic behaviors with lowest coercivity of ~0.26Oe for alloy system of Ni~8%. Effect of thermal treatment on structural evolution as well as on magnetic properties was investigated for glassy alloy of Fe60Ni12B24Nb4 and a direct correlation was found. Low-field magnetic study revealed magnetic softening behavior followed by magnetic hardening and was attributed to structure relaxation and partial devitrification into nanocrystalline state of the amorphous precursors. Electrical transport properties of as-quenched glassy ribbons were found rather weak temperature dependent with positive temperature coefficient of resistivity in temperature range of 77-300K. Electrical resistivity of the studied glassy alloy was observed to decrease significantly by factor of two with the addition of Ni content for x~2- 14.
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-101831OAI: oai:DiVA.org:kth-101831DiVA: diva2:549752
QC 201209062012-09-062012-09-052012-09-06Bibliographically approved