Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Aging Behaviors of a Rapidly Solidified Al-Li-Cu-Mg-Zr Alloy

급냉응고된 AI-Li-Cu-Mg-Zr 합금의 시효거동

  • Nam, D.H. (Department of Metallurgical Engineering, Pusan National University) ;
  • Hong, Y.J. (Department of Metallurgical Engineering, Pusan National University) ;
  • Jeong, H.Y. (Department of Materials Engineering, Pusan National Institute of Technology) ;
  • Bae, C.H. (Department of Materials Engineering, Pusan National Institute of Technology) ;
  • Kim, I.B. (Department of Metallurgical Engineering, Pusan National University)
  • 남동회 (부산대학교 공과대학 금속공학과) ;
  • 홍영준 (부산대학교 공과대학 금속공학과) ;
  • 정해용 (국립 부산공업대학 재료공학과) ;
  • 배차헌 (국립 부산공업대학 재료공학과) ;
  • 김인배 (부산대학교 공과대학 금속공학과)
  • Published : 1991.06.29
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Abstract

Effects of aging treatment on the microstructures and microhardness of a rapidly solidified Al-Li-Cu-Mg-Zr alloy were investigated by differential scanning calorimetry(DSC) and transmission electron microscopy(TEM). The as-melt-spun ribbon was consisted of fine ${\delta}^{\prime}$ and icosahedral intermetallic compound which were precipitated in the matrix. Two exothermic peaks with the range of $120^{\circ}C-190^{\circ}C$ and $280^{\circ}C-344^{\circ}C$ corresponded to ${\delta}^{\prime}$ and ${\theta}^{\prime}$, S', $T_1$ precipitating reaction respectively, and two endothermic peaks with the range of $190^{\circ}C-280^{\circ}C$ and $344^{\circ}C-550^{\circ}C$ corresponded to dissolution of ${\delta}^{\prime}$ and ${\theta}^{\prime}$, S', $T_1$ respectively in DSC curves. Peak hardness value was obtained at $210^{\circ}C$ for 1 hr aging treatment.

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