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首页> 外文期刊>Journal of Materials Research >Two-phase separated growth and peritectic reaction during directional solidification of Cu-Ge peritectic alloys
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Two-phase separated growth and peritectic reaction during directional solidification of Cu-Ge peritectic alloys

机译：Cu-Ge包晶合金定向凝固过程中的两相分离生长和包晶反应

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摘要

During directional solidification of Cu-Ge peritectic alloys, a two-phase separated structure has been observed. With proper growth conditions, the peritectic ζ-Cu_5Ge and primary α-Cu phases completely separate and form cylindrical layered structures. It is found that the formation of the separated structure is closely related to double diffusive convection and growth conditions. In the two-phase separated structure, a large trijunction region of peritectic reaction forms around the cylindrical α-Cu phase. During peritectic reaction, the morphological instabilities of ζ-Cu_5Ge occur under high pulling velocities and are explained by the constitutional undercooling criterion. A new coupling growth between the ζ-Cu_5Ge-phase and the groove of α-Cu phase near the trijunction is observed. Different from peritectic coupling growth, the diffusion coupling is established below the peritectic temperature. This two-phase separated growth process creates new opportunities for the fabrication of functionally layered materials.
机译：在Cu-Ge包晶合金的定向凝固过程中，观察到两相分离的结构。在适当的生长条件下，包晶的ζ-Cu_5Ge相和初级α-Cu相完全分离并形成圆柱状的层状结构。发现分离结构的形成与双重扩散对流和生长条件密切相关。在两相分离的结构中，在圆柱α-Cu相周围形成了大的包晶反应的三结区。在包晶反应过程中，ζ-Cu_5Ge的形貌不稳定性在高拉速下发生，并由组织过冷准则解释。观察到在三结附近的ζ-Cu_5Ge相和α-Cu相的沟槽之间有新的耦合生长。与包晶耦合生长不同，扩散耦合在包晶温度以下建立。这种两阶段分离的生长过程为功能层状材料的制造创造了新的机会。

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  • 来源
    《Journal of Materials Research》 |2013年第10期|1372-1377|共6页
  • 作者

    Shujie Wang; Liangshun Luo; Yanqing Su; Fuyu Dong; Jingjie Guo; Hengzhi Fu;

  • 作者单位

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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