한국주조공학회

The microstructures of rapidly solidified binary Ti-Al alloys containing 45»-58 at%Al have been studied using C/S (carbonl sulfur), N/O (nitrogen/ oxygen) analyser, X-ray fluorescence spectrometer (XRF), X-ray diffractometer (XRD), optical microscope (OM) and scanning electron microscope (SEM). The phases present in the alloys and their distribution were found to be a sensitive function of Al content. Essentially single-phase (7) microstructures were observed to alloys with 45 at%Al, 55 at%Al and 58 at%Al. In other content alloys, two phase (org, 7) microstructures were observed. The 48 at%Al, 52 at%Al alloys contain ('y+orQ) phase and on phase. These results indicate that rapid solidification affect the solidification path, then metastable phase forming during solidification.