Oxygen-driven impurities scavenging before solidification of Fe-based metallic glasses

Oxygen and impurities are basically unavoidable during the manufacturing of Fe-based metallic glasses, frequently impeding the products' performance and greatly increasing the processing cost. Until now, how oxygen affects the glass-forming ability remains controversial, and eliminating the adv...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-01, Vol.773, p.401-412
Main Authors: Yang, Weiming, Wang, Qianqian, Ling, Haibo, Liu, Haishun, Xue, Lin, He, Yezeng, Li, Qiang, Shen, Baolong
Format: Article
Language:English
Subjects:
Amorphous materials
Fe-based metallic glasses
Flotation
Glass
Glass formation
Impurities
Impurity-scavenger
Innovations
Iron
Magnetic properties
Mechanical properties
Melts
Metallic glasses
Microstructure
Oxygen
Oxygen and impurities
Purity
Raw materials
Scavenging
Solidification
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Summary:Oxygen and impurities are basically unavoidable during the manufacturing of Fe-based metallic glasses, frequently impeding the products' performance and greatly increasing the processing cost. Until now, how oxygen affects the glass-forming ability remains controversial, and eliminating the adverse effects of oxygen and impurities is still a huge challenge. Here we discover a new force of oxide inclusion flotation that drives the occurrence of purification, by blowing oxygen into the Fe-based melts, which help to mix the melts well to accelerate the oxidization and elimination of impurities from commercial raw materials. The synergistic reaction of oxygen and impurities not only improves the glass forming ability, magnetic and mechanical properties of the products, but also makes the stringent processing requirements, e.g. high-purity starting materials and/or high-purity argon, unnecessary. This study uncovers the mystery of oxygen in the glass formation, extends the innovation of fabrication process and highlights a significant technological breakthrough to reduce industrial production cost of Fe-based metallic glasses. •A new force of oxide inclusion flotation in Fe-based melts was discovered.•The mystery of oxygen in the glass formation for Fe-based BMGs was revealed.•Mechanism of purification by oxygen in Fe-based melts was proposed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.09.242