Abstract
Abstract In the present study, the effect of Co addition on the microstructural features, martensitic transformation beahviors and mechanical properties of Ti–V–Al alloys was investigated systematically. The results revealed that phase constituents varied with Co content increasing, which can be summarized as follows: sole α martensite phase → coexistence of α martensite phase and β austenite phase → fully β austenite phase. Correspondingly, the reverse martensitic transformation temperature continuously decreased with Co content increasing. Moreover, the moderate Co addition can improve yield strength and elongation of Ti–V–Al alloys as a consequence of the solid solution strengthening effect. The maximum yield stress of 811 MPa and superior elongation of 23.8% can be obtained in Ti–V–Al–Co2.0 and Ti–V–Al–Co1.0 alloy, respectively. Besides, Co addition led to the significant improvement of the higher temperature yield strength of quaternary Ti–V–Al–Co alloys, compared with the Ti–V–Al alloy without Co addition.
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