プラズマ回転電極法による TiAl 合金粉末のホットプレスとその焼結体の機械的諸性質

概要

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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 1223K and 200MPa. In order to produce such a dense compact from the as-PREPed powder, it was necessary to carry out VHP at 1323K and 100MPa. 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 973-1123K was considerably higher than that of the as-cast specimen of TiAl alloy produced by conventional melting process.
社団法人日本鉄鋼協会の論文
1990-05-01