| The Ti-aluminides have the potential for high temperature structural applications because of their interesting characteristics. As compared to conventional Ti alloys, Ti-aluminides offer higher stiffness as well as superior creep and oxidation resistance with a low density. In this work, Ti-aluminide intermetallic compound was formed from high purity elemental Ti and Al foils by self-propagating high-temperature synthesis(SHS) in hot, press. Formation of titanium aluminides at the interface between Ti and Al foil was observed to be controlled by pressure and heating rate. Especially, the heating rate was the most important factor to farm intermetallic compound by SHS reaction. In the effect of Cr and Mn additions, SHS reaction temperatures were decreasing and the resultant composite. microstructures were consisted of a fully dense, well-bonded intermetallic composite. After the SHS reaction of alternatively layered 10 Ti and 9 Al foils with evaporated Cr or Mn coting layer, intermetallic sheets of 700 ㎛ thick Ti-46%Al-2 wt%M (M = Cr, Mn) were formed by heat treatment at 1000℃ for 10 hours. |
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