Abstract
The effect of grain size and titanium content on the flow stress was studied at room temperature for solution-treated CuTi alloys. It was found that the Hall-Petch relation is valid for the four compositions tested: Cu-1.5 wt% Ti, Cu-2.7 wt% Ti, Cu-4.5 wt% Ti and Cu-5.4 wt% Ti alloys. The Hall-Petch constants σoϵ and kϵ in the equation: σϵ = σoϵ + kϵ · d−12 increase with increasing strain as well as Ti content. σoϵ and kϵ are related to strain (ϵ) in such a way that σoϵ is proportional to ϵ for 1.5 and 2.7 wt% Ti alloys, and ϵ32 for 4.5 and 5.4 wt% Ti alloys, while kϵ is proportional to ϵ12 for all four alloys.Considerable increase in yield strength has been observed with increasing Ti content at a common grain size. The increase in yield strength in high Ti content (4.5 and 5.4 wt% Ti) alloys is associated with solid solution strengthening, grain size strengthening as well as fine scale precipitation, first as a mottled structure in Cu-4.5 wt% Ti, and then as a metastable, body-centred tetragonal Cu4Ti phase, β′ in Cu-5.4 wt% Ti alloy, formed during quenching itself.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call