Ti-Al(Si, B)化合物焼結体の高温強度

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The objective of this work is to evaluate practically the potential of TiAl type P/M alloys for higher temperature structural applications. TiAl alloys mainly containing 1.4%Si (0.06%B), previously reported to have a good oxidation resistance, were investigated in the light of mechanical properties and plastic deformation (processing) at higher temperature.<BR>The results were summarized as follows:<BR>(1) TiAl type alloys investigated here have a ductile-brittle transition temperature in the vicinity of 800°C. The tensile behavior of TiAl specimens with and without Si content are much the same in the strength but fairly different in the strain for fracture at higher temperature.<BR>(2) Flow stress (deformation) appears to be controlled superplastically (strain rate sensitivity m≥0.3) at lower strain rate in the refined grain size of a few μm, in both tension and compression, where its dependence on strain rate is influenced by Si additive, besides powder particle size and temperature as usual.<BR>(3) Siliconizing TiAl P/M parts using the pack-cementation process may be recommended for almost no Si-in-fluence on mechanical properties, though Si alloyed to TiAl (B) lowers its tensile elongation at 1000°C or more. (Received January 18, 1990)
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