Abstract
Consolidation of rapidly solidified titanium aluminide (Ti3Al) powders employing explosive shock pressure followed by hot isostatic pressing (“hipping”) was carried out successfully. Shock densification was achieved by using a double tube design in which the flyer tube was explosively accelerated, impacting the powder container. Elemental mixtures of Ti (15 wt pet) and Al (15 wt pct) powders were added to intermetallic compound powders (Ti3Al). Hipping was used to chemically induce bonding between Ti3Al particles. The highly exothermic reactions were activated by hipping at 1000 ‡C and enhanced the bonding between the inert intermetallic powders. Compression tests indicated strong bonding between Ti3Al particles. Well-bonded Ti3Al compacts having an average ultimate compressive strength of 2 GPa and compressive fracture strain of 20 pct were produced by this technique. The ultimate tensile strengths, due to the presence of flaws in the microstructure (microcracks and voids) and intergranular fracture observed in the reacted regions, were much lower (~250 MPa).
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