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

Sansan Shuai, Enyu Guo, Mingyue Wang, Mark D. Callaghan, Tao Jing, Qiwei Zheng, Peter D. Lee

    Research output: Contribution to journalArticlepeer-review

    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 ⟨ 21 3 ¯ 1 ⟩ , rather than the previously reported ⟨ 11 2 ¯ 0 ⟩ and ⟨ 22 4 ¯ 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.

    Original languageEnglish
    Pages (from-to)4368-4373
    Number of pages6
    JournalMetallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
    Volume47
    Issue number9
    Early online date8 Jul 2016
    DOIs
    Publication statusPublished - 1 Sept 2016

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