Preparation of Fe-based monodisperse spherical particles with fully glassy phase |
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Authors: | Ayako Miura Akira Kawasaki |
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Affiliation: | Department of Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba, Aramaki, Aobaku, Sendai 980-8579, Japan |
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Abstract: | In this study, we prepared monodisperse spherical particles of a desired diameter using [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 alloy; the particles were prepared by using an atomization process developed by us. The particles have perfect sphericity and narrow size distribution along with a homogeneous composition. The phase transitions of particles from the fully glassy phase to the crystalline phase via mixed phase structures occurred as the particle diameter was increased; the particles produced in the fully glassy phase in an argon atmosphere had a diameter of less than 300 μm. This allowed the estimation of the intrinsic critical cooling rate for the particles with a fully glassy phase, Rc:Rc varied in the range of 700-900 K/s and depended only on the initial temperature of the alloy melt. |
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Keywords: | Metallic glasses Amorphous materials Microstructure Rapid-solidification Powder metallurgy |
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