Structure, Properties, and Glass Forming Ability of Melt-Spun Fe-Zr-B-Cu Alloys with Different Zr/B Ratios |
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| Authors: | D Arvindha Babu B Majumdar A P Srivastava B Ramakrishna Rao D Srivastava B S Murthy and D Akhtar |
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| Affiliation: | (1) Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Hyderabad, 500058, India;(2) Materials Science Division, Bhabha Atomic Research Centre, Mumbai, 400094, India;(3) Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India;(4) Naval Materials Research Laboratory, Thane, 421506, India;; |
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| Abstract: | Melt-spun ribbons of Fe99–x–y
Zr
x
B
y
Cu1 alloys with x + y = 11 and x + y = 13 were prepared under similar experimental conditions and characterized for structure and soft magnetic properties. Substitution
of Zr by B changes the structure of as-spun ribbons from completely amorphous to cellular bcc solid solution coexisting with
the amorphous phase at intercellular regions and then to completely dendritic solid solution. The glass forming ability (GFA)
of the Fe-Zr-B-Cu system, evaluated from thermodynamic properties such as enthalpy of mixing and mismatch entropy, is found
to be in good agreement with the experimental observations. Annealing of all ribbons leads to the precipitation of nanocrystalline
bcc α-Fe phase from both amorphous phase and already existing bcc solid solution. A window of alloy compositions that exhibit the
best combination of soft magnetic properties (high saturation magnetization and low coercivity) was identified. |
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