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

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• 作者：Sansan Shuai ; Enyu Guo ; Mingyue Wang…
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：47
• 期：9
• 页码：4368-4373
• 全文大小：1,827 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Structural Materials
  Physical Chemistry
  Ceramics,Glass,Composites,Natural Materials
  
• 出版者：Springer Boston
• ISSN：1543-1940
• 卷排序：47

文摘

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 \( {\langle}21\overline{3}1 {\rangle}\), rather than the previously reported \({\langle} 11\overline{2} 0{\rangle} \) and \({\langle} 22\overline{4}5 {\rangle}\) 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.Manuscript submitted March 8, 2016.