Three-dimensional distribution of solute elements in an Mg–Zn–Gd alloy during ageing process is quantitatively characterized by three-dimensional atom probe（3DAP） tomography. Based on the radius distribution function, it is found that Zn–Gd solute pairs in Mg matrix appear mainly at two peaks at early stage of ageing, and the separation distance between Zn and Gd atoms could be well rationalized by the first-principle calculation. Moreover, the fraction of Zn–Gd solute pairs increases first and then decreases due to the precipitation of long-period stacking ordered（LPSO） structures. Both the composition of the structural unit in LPSO structure and the solute enrichment around it are quantified. It is found that Zn and Gd elements are synchronized in the LPSO structure, and solute segregation of pure Zn or Gd is not observed at the transformation front of the LPSO structure in this alloy. In addition, the crystallography of transformation front is further determined by 3DAP data.
类型: 期刊论文
作者: Xin-Fu Gu,Tadashi Furuhara,Leng Chen,Ping Yang
来源: Acta Metallurgica Sinica(English Letters) 2019年02期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 金属学及金属工艺
单位: School of Materials Science and Engineering, University of Science and Technology Beijing,Institute for Materials Research, Tohoku University
基金: supported by a Grant-in-Aid for Scientific Research on Innovative Areas,‘‘Synchronized Long-Period Stacking Ordered Structure’’,from the Ministry of Education,Culture,Sports,Science and Technology,Japan(No.23109006),Fundamental Research Funds for the Central Universities(No.FRFTP-17-003A1)
分类号: TG146.22
页码: 187-193
总页数: 7
文件大小: 665K
下载量: 25
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