Dendrite remelting during rapid solidification of undercooled CoSi-CoSi2 eutectic alloys quantified by in situ synchrotron X-ray diffraction

Baker, Evan B.; Jeon, Seol; Kaban, I.; Wang, Qianqian; Gao, Jianrong; Kolbe, Matthias; SanSoucie, Michael; Matson, Douglas M.

doi:10.1016/j.scriptamat.2020.113645

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…The great heat release remelts the FCC-Co phases into the dispersed particles embedded in the Co 3 B matrix. A similar phenomenon was also reported in Co-Si alloys [38] under nonequilibrium solidification.…”

Section: Formation Of Fcc-co/co 3 B Anomalous Eutectic With High ∆Tsupporting

confidence: 86%

Re-Examination of the Microstructural Evolution in Undercooled Co-18.5at.%B Eutectic Alloy

et al. 2022

Materials

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The undercooling (∆T) dependencies of the solidification pathways, microstructural evolution, and recalescence behaviors of undercooled Co-18.5at.%B eutectic alloys were systematically explored. Up to four possible solidification pathways were identified: (1) A lamellar eutectic structure consisting of the FCC–Co and Co3B phase forms, with extremely low ΔT; (2) The FCC–Co phase primarily forms, followed by the eutectic growth of the FCC–Co and Co2B phases when ΔT < 100 K; (3) As the ΔT increases further, the FCC–Co phase primarily forms, followed by the metastable Co23B6 phase with the trace of an FCC–Co and Co23B6 eutectic; (4) When the ΔT increases to 277 K, the FCC–Co phase primarily forms, followed by an FCC–Co and Co3B eutectic, which is similar in composition to the microstructure formed with low ΔT. The mechanisms of the microstructural evolution and the phase selection are interpreted on the basis of the composition segregation, the skewed coupled zone, the strain-induced transformation, and the solute trapping. Moreover, the prenucleation of the primary FCC–Co phase was also detected from an analysis of the different recalescence behaviors. The present work not only enriches our knowledge about the phase selection behavior in the undercooled Co–B system, but also provides us with guidance for controlling the microstructures and properties practically.

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Section: Formation Of Fcc-co/co 3 B Anomalous Eutectic With High ∆Tsupporting

confidence: 86%

Re-Examination of the Microstructural Evolution in Undercooled Co-18.5at.%B Eutectic Alloy

et al. 2022

Materials

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“…Varied microstructures were achieved as a function of increasing undercooling occurring in the diverse techniques: primary dendrites or cells with regular eutectic, anomalous eutectic made of primary CoSi 2 with intergranular CoSi, complex shape of the primary phase embedding precipitates. The pathways to microstructure formation in EML samples as a function of undercooling were determined by X-ray diffraction 79 , 80 , including and evaluation of remelting behavior 81 . Further aspects of the solidification were revealed by both melt spinning (MS) and copper mold casting (CMC) 82 The first phase nucleating heterogeneously on the surface of the chilling block was most often the CoSi compound, as seen in Fig.…”

Section: Recent Achievementsmentioning

confidence: 99%

Electromagnetic levitation containerless processing of metallic materials in microgravity: rapid solidification

et al. 2023

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Space levitation processing allows researchers to conduct benchmark tests in an effort to understand the physical phenomena involved in rapid solidification processing, including alloy thermodynamics, nucleation and growth, heat and mass transfer, solid/liquid interface dynamics, macro- and microstructural evolution, and defect formation. Supported by ground-based investigations, a major thrust is to develop and refine robust computational tools based on theoretical and applied approaches. This work is accomplished in conjunction with experiments designed for precise model validation with application to a broad range of industrial processes.

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Solidification Pathways in Highly Undercooled Co79.3B20.7 Alloy

Liu

Yang

2021

Metall Mater Trans A

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Dendrite remelting during rapid solidification of undercooled CoSi-CoSi2 eutectic alloys quantified by in situ synchrotron X-ray diffraction

Cited by 5 publications

References 25 publications

Re-Examination of the Microstructural Evolution in Undercooled Co-18.5at.%B Eutectic Alloy

Re-Examination of the Microstructural Evolution in Undercooled Co-18.5at.%B Eutectic Alloy

Electromagnetic levitation containerless processing of metallic materials in microgravity: rapid solidification

Solidification Pathways in Highly Undercooled Co79.3B20.7 Alloy

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