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Synopsis : High quality TiAl powder was produced by Plasma Rotating Electrode Process (PREP). Two kinds of powders, the as-PREPed and the Ball Milled (PREP-BM) powders, were consolidated by Vacuum Hot Pressing (VHP). A compact having high relative density (•„99%) was obtained from the PREP-BM powder by VHP at 1 223 K and 200 MPa. In order to produce such a dense compact from the as-PREPed powder, it was necessary to carry out VHP at 1 323 K and 100 MPa. The compact made from the PREP-BM powder showed superior compressive strength and ductility at room temperature to that made from the as-PREPed powder. A positive temperature dependence of 0.2% proof stress was clearly observed in each compact. It was noticeable that the strength of the compacts at elevated temperature such as 9731 123 K was considerably higher than that of the as-cast specimen of TiAl alloy produced by conventional melting process.

Hot Pressing of TiAl Alloy Powder Produced by Plasma Rotating Electrode Process and the Mechanical Properties of the Hot Pressed Compacts