Magnetic field intensity dependent microstructure evolution and recrystallization behavior in a Co-B eutectic alloy

doi:10.1016/j.jmst.2022.08.014

Abstract

Abstract: Systematic understanding on the magnetic field intensity dependent microstructure evolution and recrystallization behavior in a Co-B eutectic alloy under a constant undercooling (∆T≈100 K) were carried out. Absent of the magnetic field, the comparable size of divorced FCC-Co and Co₃B eutectic ellipsoidal grains coexist with a few regular lamellas. When the magnetic field is less than 15 T, the elongated primary FCC-Co dendrites parallel to the magnetic field with the dispersed FCC-Co nano-particles embedded within the Co₃B matrix occupy the inter-dendrite regions. Once the magnetic field increases to 20 T, the FCC-Co/Co₂B anomalous eutectic colonies dominate. The formation mechanism of Co₂B phase is discussed from several aspects of the competitive nucleation, the chemical redistribution induced by the thermomagnetic-induced convection and magnetic dipole interaction, and the strain-induced transformation. Furthermore, the application of magnetic field is found to promote recrystallization, proved by the lower density of misorientation, the appearance of FCC-Co annealed twins and more Co₃B sub-grains. This work could further enrich our knowledge about the magnetic-dependent microstructure evolution and recrystallization process in the undercooled Co-B system and provide guidance for controlling the microstructures and properties under extreme conditions.

Key words: Magnetic field, Undercooled solidification, Microstructure evolution, Recrystallization, Co-B alloy

Fan Bu, Yiyuan Zhang, Haoxiang Liu, Jun Wang, Eric Beaugnon, Jinshan Li, Yixuan He. Magnetic field intensity dependent microstructure evolution and recrystallization behavior in a Co-B eutectic alloy[J]. J. Mater. Sci. Technol., 2023, 138: 93-107.

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