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The effects of Si addition on microstructures, high temperature compressive properties and creep properties of the ¢-stabilized Ti-45Al3Fe-2Mo alloy have been studied in this work. The results show that the Si addition decreases the volume fraction of ¢ phase and precipitates particulate Ti5Si3 phase. At the same time, the Si addition improves the high temperature strength of the Ti-45Al-3Fe-2Mo alloy for about 200MPa at 800°C and decreases the creep strain for about 35% at 800°C under an applied stress of 150MPa. The decrease in volume fraction of ¢ phase and precipitation of Ti5Si3 particles are believed to be the dominant mechanisms for the improvement of the high temperature properties of the Si-doped TiAl alloy. [doi:10.2320/matertrans.M2015355]

Effects of Si on Microstructures and High Temperature Properties of Beta Stabilized TiAl Alloy