Precipitation of Al3Sc in Al-0.23mass%Sc Alloy

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  • Nakayama Masaru
    Department of Materials Science and Metallurgical Engineering, Kurume National College of Technology
  • Furuta Akira
    Department of Materials Science and Engineering, Kyushu University
  • Miura Yasuhiro
    Department of Materials Science and Engineering, Kyushu University

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タイトル別名
  • Precipitation of Al<SUB>3</SUB>Sc in Al-0.23 mass%Sc Alloy
  • Precipitation of Al3Sc in Al 0.23massパー

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Age hardening and precipitation processes in an Al-0.23 mass%Sc alloy were studied by the hardness test, electrical resistivity measurement and TEM observation. The stable and coherent Al3Sc phase of the L12 ordered structure precipitates directly from a supersaturated solid solution without forming any metastable phases. A plot of the cube of the particle radius against aging time follows a straight line, suggesting that the coarsening obeys the LSW theory of the diffusion controlled ripening process. The apparent activation energy for the precipitation of the Al3Sc phase determined by electrical resistivity change is 80 kJ/mol.

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