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$Al_{71.6}Ge_{28.4}$ 공정합금의 미세구조 및 기계적 성질의 평가
Microstructural evolution and mechanical properties of $Al_{71.6}Ge_{28.4}$ eutectic alloy

박진만   (준결정재료연구단/연세대학교 금속시스템공학과UU0000936  ); 육완   (준결정재료연구단/연세대학교 금속시스템공학과UU0000936  ); 김도향   (준결정재료연구단/연세대학교 금속시스템공학과UU0000936  );
  • 초록

    In the present study, the microstructural evolution and mechanical properties of $Al_{71.6}Ge_{28.4}$ eutectic alloy have been investigated. Stable (fcc ${\alpha}$ -Al and diamond cubic ${\beta}$ -Ge) and various metastable crystalline (monoclinic, rhombohedral) phases were produced by competitive phase selection during non-equilibrium processing methods i.e. melt spinning and injection casting. The as-injection casted samples containing metastable-equilibrium eutectic ( ${\alpha}$ -Al + monoclinic) structure showed much higher strength than samples with equilibrium eutectic ( ${\alpha}-Al+{\beta}-Ge$ ) structure but plasticity disappointingly diminished. In order to endow the enhanced ductility without significant strength drop, the alloys was heat-treated at transition temperature from metastable phase to stable phase. The annealed specimen displayed the phase transformed microstructural evolution and enhanced macroscopic plasticity.


  • 주제어

    Al-Ge eutectic alloy .   Non-equilibrium processing .   Metastable phase .   Strength .   Plasticity .   Annealing.  

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