Abstract
Titanium aluminides (TiAl) with different magnesium contents of 0, 0.37, 1.84, 3.61 and 15.8 mol% were manufactured through the mechanical alloying and pulse discharge sintering process. The mechanically alloyed TiAl powders with different magnesium contents possessed similar X-ray diffraction profiles, corresponding to alpha titanium. The TiAl powders were sintered for a short sintering time of 900 s, and a complete transformation from the supersaturated alpha titanium structure to TiAl with small amount of Ti3Al phase as well as nitride were confirmed. It was found that the content of Ti3Al phase in the sintered material decreased with an increase in the magnesium content. While the TiAl alloy without magnesium addition showed a submicron structure with equiaxed gamma grains, the microstructure was coarsened by the addition of magnesium. With an increase in the magnesium content the density of the material decreased monotonically, which is attributed to the solution of light magnesium atoms to the TiAl structure and the decrease in the Ti3Al phase content. Small amount of magnesium addition (0.37 mol%) increased the Young’s modulus of TiAl alloy, but further increases in the magnesium content decreased the Young’s modulus.
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