Abstract
A hot isostatic pressing (hipping) process is often employed to prepare dense TiAI based intermetallics by liquid phase sintering in the elemental powder metallurgy (EPM) field. However, hot pressing which is cheaper than hipping, not only in preparation but also in operation, is seldom used in this field since it results in the aluminium melting and overflowing during sintering. In the present work, the solid state hot pressing process has been developed to prepare TiAI intermetallics from elemental powders by a continuous two stage sintering cycle including a solid state diffusion stage and a densification stage. The effect of process variables such as temperature, pressure, and time on the density and microstructure of specimens was investigated. The results showed that dense (α2 + γ) type TiAI intermetallics can be obtained after sintering at 630°Cfor 22 h (with the first 5 h at 45 MPa), followed by 2 h at 1250°C and 45 MPa.
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