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Volume
12, Issue 4, 2003
Mechanical
and Erosion behaviour of Ti47Al-3W/Ti2AlC Composites By Reactive
Arc-Melting
Janakarajan
Ramkumar1, Atsushi Kakitsuji3, S.K. Malhotra1,
R.Krishnamurthy1, H.Mabuchi2, H.Tsuda2,
T.Matsui2 and Kenji Morii2
1Indian
Institute of Technology Madras, Chennai, India 600 036
2Graduate school of Engineering, Osaka Prefecture University, Sakai
599-8531, Japan 3Technology Research Institute of Osaka
Prefecture, Izumi, 594-1157, Japan
(Received 3/03;
accepted 7/03)
Abstract
Ti-50Al
alloy and Ti-47Al-3W alloy and its composites have been prepared by
reactive arc melting technique using elemental powders. Composites have
been reinforced using 3.5, 10 and 18 vol% of Ti2AlC in the matrix of
TiAl with and without addition of W and C. By the addition of tungsten
and carbon to TiAl alloy, we have produced composites that are
reinforced randomly by reacted rod like Ti2AlC particles with fine
precipitate of Ti2AlC particles and B2 particles. Compared to Ti-50Al
alloys, the Ti-47Al-3W alloy and its composites have superior mechanical
properties like bending strength, hardness, fracture toughness and
erosion. Ti-47Al-3W/3.5 vol% Ti2AlC has excellent erosion resistance
because of the dispersion of fine Ti2AlC and B2 particles in the matrix.
Keywords:
Titanium aluminides; particle reinforced composites; Microstructure;
Hardness; Erosion test.
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