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The effect of heat treatment on the microstructure and tensile properties of Ti-5Al-3Zr-4Mo-3V alloy are investigated in this paper. The results showed that the microstructural evolution with temperature could be classified into three stages in terms of the variation in β matrix. At stage I (670–790°C), some acicular primary α phase was retained and coarsened in β matrix; at stage II (790–830°C), the acicular primary α phase almost completely dissolved and no secondary α phase formed in β matrix during the following air cooling, and stress-induced martensitic transformation during tensile testing at room temperature occurred which caused the “double yield” phenomenon; at stage III (830–910°C), the secondary α phase precipitated in β matrix during the cooling, which led to a significant increase in the tensile strength.

Effect of heat treatment on the microstructure and tensile properties of Ti-5Al-3Zr-4Mo-3V alloy