抄録
Powder compacts for Ti3Al, Ti3Al-7Nb and Ti3Al-13Nb alloys were manufactured by mechanical alloying-pulse discharge sintering at 1273 K and, their microstructure, oxidation resistance and mechanical properties were evaluated. The mechanically alloyed Ti3Al with different Nb contents possessed similar X-ray diffraction profiles, corresponding to alpha titanium. The Ti3Al-Nb powders were sintered for a short time of 600 s at 1273 K, and a complete transformation from the supersaturated alpha titanium structure to Ti3Al were confirmed. The sintered compacts had a homogeneous fine microstructure. Microhardness obviously increased with Nb contents for Ti3AI. Adding Nb clearly improved oxidation resistance of Ti3Al, although the effect decreased at 1273 K.
