Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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A Study on the Microstructures of Rapidly Solidified Ti-48Al-xCr Intermetallic Compounds

급속응고한 Ti-48Al-xCr 금속간화합물의 미세조직에 관한 연구

  • Jeong, Tae-Ho (Dept. of Metallurgy and Materials Eng., Hanyang Univ.) ;
  • Hwang, Jung-Hyun (Dept. of Metallurgy and Materials Eng., Hanyang Univ.) ;
  • Nam, Tae-Woon (Dept. of Metallurgy and Materials Eng., Hanyang Univ.)
  • 정태호 (한양대학교 금속재료공학과) ;
  • 황정현 (한양대학교 금속재료공학과) ;
  • 남태운 (한양대학교 금속재료공학과)
  • Published : 1999.12.20
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Abstract

The effects of rapid solidification and Cr addition to the microstructure variations of the rapid solidified Ti-48Al-xCr(X = 2,4,6) alloys have been investigated using X-ray diffractometry, optical microscopy, scanning electron microscopy and transmission electron microscopy. The segregated coarse ${\gamma}$ phase was eliminated and the microstructure was refined by rapid solidification of the cooling rate of $10^4-10^6\;^{\circ}C/sec$. The lattice parameters and tetragonality of ${\gamma}$ phase decrease with the increase Cr content and by the rapid solidification. Non-equilibrium phase ${\alpha}$ remains at room temperature condition, which would be resulted from the restriction of phase transformation ${\alpha}$ to ${\alpha}_2+{\gamma}$.

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