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In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy

The solidification sequence of an AlMg4.7Si8 alloy is imaged in situ by synchrotron microtomography. Tomograms with (1.4 μm)(3)/voxel have been recorded every minute while cooling the melt from 600 °C at a cooling rate of 5 K min(−1) to 540 °C in the solid state. The solidification process starts wi...

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Autores principales: Tolnai, D., Townsend, P., Requena, G., Salvo, L., Lendvai, J., Degischer, H.P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier Science 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587344/
https://www.ncbi.nlm.nih.gov/pubmed/23470958
http://dx.doi.org/10.1016/j.actamat.2012.01.024
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author Tolnai, D.
Townsend, P.
Requena, G.
Salvo, L.
Lendvai, J.
Degischer, H.P.
author_facet Tolnai, D.
Townsend, P.
Requena, G.
Salvo, L.
Lendvai, J.
Degischer, H.P.
author_sort Tolnai, D.
collection PubMed
description The solidification sequence of an AlMg4.7Si8 alloy is imaged in situ by synchrotron microtomography. Tomograms with (1.4 μm)(3)/voxel have been recorded every minute while cooling the melt from 600 °C at a cooling rate of 5 K min(−1) to 540 °C in the solid state. The solidification process starts with the three-dimensional evolution of the α-Al dendritic structure at 590 °C. The growth of the α-Al dendrites is described by curvature parameters that represent the coarsening quantitatively, and ends in droplet-like shapes of the secondary dendrite arms at 577 °C. There, the eutectic valley of α-Al/Mg(2)Si is reached, forming initially octahedral Mg(2)Si particles preferentially at the bases of the secondary dendrite arms. The eutectic grows with seaweed-like Mg(2)Si structures, with increasing connectivity. During this solidification stage Fe-aluminides form and expand as thin objects within the interdendritic liquid. Finally, the remaining liquid freezes as ternary α-Al/Mg(2)Si/Si eutectic at 558 °C, increasing further the connectivity of the intermetallic phases. The frozen alloy consists of four phases exhibiting morphologies characteristic of their mode of solidification: α-Al dendrites, eutectic α-Al/Mg(2)Si “Chinese script” with Fe-aluminides, and interpenetrating α-Al/Mg(2)Si/Si ternary eutectic.
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spelling pubmed-35873442013-03-05 In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy Tolnai, D. Townsend, P. Requena, G. Salvo, L. Lendvai, J. Degischer, H.P. Acta Mater Article The solidification sequence of an AlMg4.7Si8 alloy is imaged in situ by synchrotron microtomography. Tomograms with (1.4 μm)(3)/voxel have been recorded every minute while cooling the melt from 600 °C at a cooling rate of 5 K min(−1) to 540 °C in the solid state. The solidification process starts with the three-dimensional evolution of the α-Al dendritic structure at 590 °C. The growth of the α-Al dendrites is described by curvature parameters that represent the coarsening quantitatively, and ends in droplet-like shapes of the secondary dendrite arms at 577 °C. There, the eutectic valley of α-Al/Mg(2)Si is reached, forming initially octahedral Mg(2)Si particles preferentially at the bases of the secondary dendrite arms. The eutectic grows with seaweed-like Mg(2)Si structures, with increasing connectivity. During this solidification stage Fe-aluminides form and expand as thin objects within the interdendritic liquid. Finally, the remaining liquid freezes as ternary α-Al/Mg(2)Si/Si eutectic at 558 °C, increasing further the connectivity of the intermetallic phases. The frozen alloy consists of four phases exhibiting morphologies characteristic of their mode of solidification: α-Al dendrites, eutectic α-Al/Mg(2)Si “Chinese script” with Fe-aluminides, and interpenetrating α-Al/Mg(2)Si/Si ternary eutectic. Elsevier Science 2012-04 /pmc/articles/PMC3587344/ /pubmed/23470958 http://dx.doi.org/10.1016/j.actamat.2012.01.024 Text en © 2012 Elsevier Ltd. https://creativecommons.org/licenses/by-nc-nd/3.0/ Open Access under CC BY-NC-ND 3.0 (https://creativecommons.org/licenses/by-nc-nd/3.0/) license
spellingShingle Article
Tolnai, D.
Townsend, P.
Requena, G.
Salvo, L.
Lendvai, J.
Degischer, H.P.
In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy
title In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy
title_full In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy
title_fullStr In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy
title_full_unstemmed In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy
title_short In situ synchrotron tomographic investigation of the solidification of an AlMg4.7Si8 alloy
title_sort in situ synchrotron tomographic investigation of the solidification of an almg4.7si8 alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3587344/
https://www.ncbi.nlm.nih.gov/pubmed/23470958
http://dx.doi.org/10.1016/j.actamat.2012.01.024
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