In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy

In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy

Abstract The solidification mechanism and segregation behavior of laser-melted Mn35Fe5Co20Ni20Cu20 was firstly investigated via in situ synchrotron x-ray diffraction at millisecond temporal resolution. The transient composition evolution of the random solid solution during sequential solidification...

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Autores principales: Benjamin Schneiderman, Andrew Chihpin Chuang, Peter Kenesei, Zhenzhen Yu
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/7c7520a00ce94bcdb55b42d2e1a52062
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spelling oai:doaj.org-article:7c7520a00ce94bcdb55b42d2e1a520622021-12-02T17:04:59ZIn situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy10.1038/s41598-021-85430-z2045-2322https://doaj.org/article/7c7520a00ce94bcdb55b42d2e1a520622021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85430-zhttps://doaj.org/toc/2045-2322Abstract The solidification mechanism and segregation behavior of laser-melted Mn35Fe5Co20Ni20Cu20 was firstly investigated via in situ synchrotron x-ray diffraction at millisecond temporal resolution. The transient composition evolution of the random solid solution during sequential solidification of dendritic and interdendritic regions complicates the analysis of synchrotron diffraction data via any single conventional tool, such as Rietveld refinement. Therefore, a novel approach combining a hard-sphere approximation model, thermodynamic simulation, thermal expansion measurement and microstructural characterization was developed to assist in a fundamental understanding of the evolution of local composition, lattice parameter, and dendrite volume fraction corresponding to the diffraction data. This methodology yields self-consistent results across different methods. Via this approach, four distinct stages were identified, including: (I) FCC dendrite solidification, (II) solidification of FCC interdendritic region, (III) solid-state interdiffusion and (IV) final cooling with marginal diffusion. It was found out that in Stage I, Cu and Mn were rejected into liquid as Mn35Fe5Co20Ni20Cu20 solidified dendritically. During Stage II, the lattice parameter disparity between dendrite and interdendritic region escalated as Cu and Mn continued segregating into the interdendritic region. After complete solidification, during Stage III, the lattice parameter disparity gradually decreases, demonstrating a degree of composition homogenization. The volume fraction of dendrites slightly grew from 58.3 to 65.5%, based on the evolving composition profile across a dendrite/interdendritic interface in diffusion calculations. Postmortem metallography further confirmed that dendrites have a volume fraction of 64.7% ± 5.3% in the final microstructure.Benjamin SchneidermanAndrew Chihpin ChuangPeter KeneseiZhenzhen YuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Benjamin Schneiderman
Andrew Chihpin Chuang
Peter Kenesei
Zhenzhen Yu
In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy
description Abstract The solidification mechanism and segregation behavior of laser-melted Mn35Fe5Co20Ni20Cu20 was firstly investigated via in situ synchrotron x-ray diffraction at millisecond temporal resolution. The transient composition evolution of the random solid solution during sequential solidification of dendritic and interdendritic regions complicates the analysis of synchrotron diffraction data via any single conventional tool, such as Rietveld refinement. Therefore, a novel approach combining a hard-sphere approximation model, thermodynamic simulation, thermal expansion measurement and microstructural characterization was developed to assist in a fundamental understanding of the evolution of local composition, lattice parameter, and dendrite volume fraction corresponding to the diffraction data. This methodology yields self-consistent results across different methods. Via this approach, four distinct stages were identified, including: (I) FCC dendrite solidification, (II) solidification of FCC interdendritic region, (III) solid-state interdiffusion and (IV) final cooling with marginal diffusion. It was found out that in Stage I, Cu and Mn were rejected into liquid as Mn35Fe5Co20Ni20Cu20 solidified dendritically. During Stage II, the lattice parameter disparity between dendrite and interdendritic region escalated as Cu and Mn continued segregating into the interdendritic region. After complete solidification, during Stage III, the lattice parameter disparity gradually decreases, demonstrating a degree of composition homogenization. The volume fraction of dendrites slightly grew from 58.3 to 65.5%, based on the evolving composition profile across a dendrite/interdendritic interface in diffusion calculations. Postmortem metallography further confirmed that dendrites have a volume fraction of 64.7% ± 5.3% in the final microstructure.
format article
author Benjamin Schneiderman
Andrew Chihpin Chuang
Peter Kenesei
Zhenzhen Yu
author_facet Benjamin Schneiderman
Andrew Chihpin Chuang
Peter Kenesei
Zhenzhen Yu
author_sort Benjamin Schneiderman
title In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy
title_short In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy
title_full In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy
title_fullStr In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy
title_full_unstemmed In situ synchrotron diffraction and modeling of non-equilibrium solidification of a MnFeCoNiCu alloy
title_sort in situ synchrotron diffraction and modeling of non-equilibrium solidification of a mnfeconicu alloy
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/7c7520a00ce94bcdb55b42d2e1a52062
work_keys_str_mv AT benjaminschneiderman insitusynchrotrondiffractionandmodelingofnonequilibriumsolidificationofamnfeconicualloy
AT andrewchihpinchuang insitusynchrotrondiffractionandmodelingofnonequilibriumsolidificationofamnfeconicualloy
AT peterkenesei insitusynchrotrondiffractionandmodelingofnonequilibriumsolidificationofamnfeconicualloy
AT zhenzhenyu insitusynchrotrondiffractionandmodelingofnonequilibriumsolidificationofamnfeconicualloy
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