Abstract
The P/M processing of titanium aluminide using amorphous TiAl is developed by which it is possible to overcome inherent fabricability problems and to obtain a fine microstructure. A high quality amorphous TiAl pow- der produced by reaction ball milling shows clear glass transition far below a temperature at the onset of crystalli- zation in differential scanning calorimetry above a heating rate of 0.05 K/s. We obtained a fully dense compact of amorphous TiAl powders, encapsulated in a vacuumed can, via viscous flow by hot isostatic pressing (HIP). Iso- thermally annealing of HIP'ed amorphous compact under a pressure of 196 MPa shows a progressive growth of γ- TiAl phase with α2 (Ti3Al), which is characterized by increasing sharpness of X-ray peaks with temperature. Fully dense HIP'ed compact of titanium aluminide TiAl shows a high hardness of 505 Hv, suggesting strengthening mechanisms by sub-micron sized grain of γ-TiAl and particle-dispersion by second phase constituent, α2. (Received January 13, 2016; Revised January 18, 2016; Accepted January 22, 2016)
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