Abstract
Rapidly solidified powders of a Ti-48at%Al alloy were successfully consolidated using the CERACON® process, a quasi-isostatic method of pressure sintering. Full density was readily achieved in canned powders preheated from 1473 to 1573 K for 30 min and pressurized at 1.24 GPa for 45 sec inside a carbonaceous particulate medium at 1773 K. Rapid densification is facilitated by the enhanced plasticity associated with the presence of a significant volume fraction of disordered a-(Ti) in this temperature range. The microstructure of the densified compact consists primarily of γ with small amounts of α2. The outer layers, however, exhibit a duplex microstructure consisting of predominantly γ particles surrounded by supersaturated α2 filling the prior interparticle spaces. Microstructure evolution during consolidation is elucidated and related to the relevant process parameters.
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CERACON® is a trademark of Ceracon, Inc., Sacramento, CA 95826, USA.
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Levi, C.G., Mehrabian, R., Oslin, B. et al. Consolidation of rapidly solidified intermetallic powders using the Ceracon® process. J. Mater. Shaping Technol. 6, 125–132 (1988). https://doi.org/10.1007/BF02834827
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DOI: https://doi.org/10.1007/BF02834827