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Materials & Design v.117, 2017년, pp.338 - 345   SCIE
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Design and microstructure analysis of globules in Al-Co-La-Pb immiscible alloys with an amorphous phase

Nagase, Takeshi (Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan ) ; Takemura, Mamoru (Technology Research Institute of Osaka Prefecture, 2-7-1, Ayumino, Izumi, Osaka 594-1157, Japan ) ; Matsumuro, Mitsuaki (Technology Research Institute of Osaka Prefecture, 2-7-1, Ayumino, Izumi, Osaka 594-1157, Japan ) ; Matsumoto, Megumi (Center for Supports to Research and Education Activities, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan ) ; Fujii, Yoshikazu (Center for Supports to Research and Education Activities, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan ) ;
  • 초록  

    Abstract An immiscible alloy with an amorphous phase, Al-Co-La-Pb, was designed by the combination of empirical rules, prediction of phase diagrams based on ab initio calculations, and thermodynamic calculations. The solidification microstructure of rapidly solidified Al-Co-La-Pb melt-spun ribbons was investigated. Liquid-phase separation and the formation of an amorphous phase occurred simultaneously in the Al-Co-La-Pb alloy, resulting in the formation of Pb globules embedded in the Al-Co-La–based amorphous matrix. The particle size distribution of the globules and the formation of Pb nanoglobules were explained by the multistep liquid-phase separation. STEM observation clarified the microstructure of oxygen-enriched globules with double shell layers in the Al-Co-La-Pb alloy. Highlights An immiscible Al-Co-La-Pb alloy with an amorphous phase was designed. Ultra-fine Pb globules, dispersed in Al-based amorphous alloys, were successfully obtained. Multistep liquid-phase separation occurred in Al-Pb–based immiscible alloys. STEM clarified the particle structures in Pb-enriched and oxide globules Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Amorphous material .   Composite material .   Alloy design .   Solidification .   Electron microscopy .   Microstructure.  

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