한국주조공학회

The effects ofrapid solidification and Cr addition to the microstructure variations ofthe 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 7/phase was eliminated and the microstructure was refined by rapid solidification of the cooling rate of 104- 1 06 °C/sec. The lattice parameters and tetragonality of}/phase decrease with the increase Cr content and by the rapid solidification. Non-equilibrium phase at remains at room temperature condition, which would be resulted from the restriction ofphase transformationato az +7/.