Synchrotron tomographic quantification of the influence of Zn concentration on dendritic growth in Mg-Zn alloys
Synchrotron tomographic quantification of the influence of Zn concentration on dendritic growth in Mg-Zn alloys
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同步加速器断层扫描量化 Zn 浓度对 Mg-Zn 合金中枝晶生长的影响
DOI:
10.1016/j.actamat.2018.06.026
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发表时间:
2018-09
期刊:
影响因子:
9.4
通讯作者:
Peter D. Lee
中科院分区:
文献类型:
--
作者:
Sansan Shuai;Enyu Guo;Jiang Wang;A.B. Phillion;Tao Jing;Zhongming Ren;Peter D. Lee
Dendritic microstructural evolution during the solidification of Mg-Zn alloys was investigated as a function of Zn concentration usingin situsynchrotron X-ray tomography. We reveal that increasing Zn content from 25 wt% to 50 wt% causes a Dendrite Orientation Transition (DOT) from a six-fold snow-flake structure to a hyper-branched morphology and then back to a six-fold structure. This transition was attributed to changes in the anisotropy of the solid-liquid interfacial energy caused by the increase in Zn concentration. Further, doublon, triplon and quadruplon tip splitting mechanisms were shown to be active in the Mg-38 wt%Zn alloy, creating a hyper-branched structure. Using the synchrotron tomography datasets, we quantify, for the first time, the evolution of grain structures during the solidification of these alloys, including dendrite tip velocity in the mushy zone, solid fraction, and specific surface area. The results are also compared to existing models. The results demonstrate the complexity in dendritic pattern formation in hcp systems, providing critical input data for the microstructural models used for integrated computational materials engineering of Mg alloys.
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