Abstract
In this paper, the ageing response and the mechanical properties of Ti-5553 (Ti–5Al–5V–5Mo–3Cr) and Ti-5553s (Ti–5Al–5V–5Mo–3Cr–0.4Si) alloys are comparatively investigated. During ageing at 650°C, the hardness of the alloys first increases in 30min and remains constant from 1h to 8h, and then decreases with further increase the ageing time to 29h. This variation is related to the chemical composition and the volume fraction of α phase. The mechanical properties of the 5h aged Ti-5553 and Ti-5553s alloys are investigated, and the result shows that the ultimate tensile strength of the Ti-5553s alloy is higher than that of Ti-5553 alloy while the ductility of the Ti-5553s alloy slightly decreases. The tensile fracture of the Ti-5553s alloy shows a mixed model of intergranular fracture and cleavage fracture.
Published Version
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