Abstract
Rapidly solidified titanium aluminide alloys containing 5 and 15 at.% Nb additions were produced in the form of melt-spun ribbon, pulverized and consolidated by hot extrusion. Tensile tests were performed at room temperature and 650°C on as-extruded alloy samples. The microstructure of as-extruded alloys was investigated through transmission electron microscopy. The microstructure of Ti 3Al alloys containing 5 at.% Nb in the as-extruded state consisted of 100% α 2, whereas the microstructure of alloys containing 15 at.% Nb consisted of acicular martensite and platelets of B2-ordered β 2 phase in the β matrix. Fracture surfaces were examined in a scanning electron microscope. A homogeneous dispersion of Er 2O 3 particles tended to promote failure through microvoid coalescence and dispersed slip in the matrix.
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