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Halo formation of Zn-Al alloys under conventional solidification and intensive convection solidification
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 696, p. 460-469Article in journal (Refereed) Published
Abstract [en]

A halo occurred usually as an envelope of one phase around a primary phase in many alloys after solidification. Its formation mechanism was investigated for hypoeutectic, eutectic and hypereutectic compositions of Zn-Al alloys under conventional solidification and under intensive convection solidification. It was found that the Zn-rich halos occurred in the surroundings of the Al-rich primary phase for the hypereutectic Zn-Al alloys at Al>5 wt% and no halos occurred for the hypoeutectic and eutectic Zn-Al alloys at Al≤5 wt% under conventional solidification. However, the Zn-rich halos were completely absent from the Al-rich phase because of the uniform temperature distribution and enhanced mass transport under intensive convection solidification. Once the intensive convection was interrupted during solidification for the solid-liquid co-existing melt, a halo was formed on the surface of the existing Al-rich phase created either during the primary solidification or the eutectic solidification. Therefore, it was concluded that the halo formation should be a growth-dominant phenomenon not a nucleation-dominant phenomenon. And, the interaction among the solid phases and the liquid phase was responsible for the halo formation, in which the difference in the elasticity modulus and the density of the different phases resulted in the variation of strain energy in the individual phase.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 696, p. 460-469
Keywords [en]
Alloys, Crystal growth, Halo formation, Microstructure, Solidification
National Category
Metallurgy and Metallic Materials Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-200871DOI: 10.1016/j.jallcom.2016.11.281ISI: 000391819800062Scopus ID: 2-s2.0-84999028707OAI: oai:DiVA.org:kth-200871DiVA, id: diva2:1071200
Note

QC 20170203

Available from: 2017-02-03 Created: 2017-02-03 Last updated: 2017-11-29Bibliographically approved

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CiteExportLink to record
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  • apa
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  • de-DE
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