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Anomalous alpha-Mg Dendrite Growth During Directional Solidification of a Mg-Zn Alloy

Shuai, S; Guo, E; Wang, M; Callaghan, MD; Jing, T; Zheng, Q; Lee, PD; (2016) Anomalous alpha-Mg Dendrite Growth During Directional Solidification of a Mg-Zn Alloy. Metallurgical and Materials Transactions A , 47A (9) pp. 4368-4373. 10.1007/s11661-016-3618-0. Green open access

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Abstract

Dendritic morphology was investigated in a directionally solidified magnesium-zinc alloy using synchrotron X-ray tomography and electron backscattered diffraction. Unexpectedly, primary dendrites grew along ⟨213¯¯¯1⟩⟨213¯1⟩ , rather than the previously reported ⟨112¯¯¯0⟩⟨112¯0⟩ and ⟨224¯¯¯5⟩⟨224¯5⟩ directions. Further, seven asymmetric sets of side branches formed, instead of six-fold symmetric arms, evolving with three coexisting morphologies per trunk of: traditional, seaweed structure, and free growth. The anomalous growth is attributed to the imposed thermal gradient and zinc-induced interfacial energy anisotropy variations.

Type: Article
Title: Anomalous alpha-Mg Dendrite Growth During Directional Solidification of a Mg-Zn Alloy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s11661-016-3618-0
Publisher version: https://doi.org/10.1007/s11661-016-3618-0
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Technology, Materials Science, Multidisciplinary, Metallurgy & Metallurgical Engineering, Materials Science, PHASE-FIELD SIMULATIONS, ORIENTATION SELECTION, MAGNESIUM ALLOYS, ISOTACTIC POLYSTYRENE, THIN-FILMS, MORPHOLOGY, EVOLUTION, ALUMINUM
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10049096
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