급속응고한 Ti-48Al-xCr 금속간화합물의 미세조직에 관한 연구

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 coarseγphase was eliminated and the microstructure was refined by rapid solidification of the cooling rate of 10⁴-106^6 ˚C/sec. The lattice parameters and tetragonality ofγphase decrease with the increase Cr content and by the rapid solidification. Non-equilibrium phase α remains at room temperature condition, which would be resulted from the restriction of phase transformation αto α₂+γ. (Received October 14, 1999)