Abstract
An investigation has been made of the mechanical properties of titanium and of Ti-0.5 wt.% Si and Ti-1.O wt.% Si alloys in the temperature range 300–900K. Dynamic strain ageing (D.S.A.), characterised by serrated yielding, has been observed between 700 and 825K and has been studied by measurements of strain rate sensitivity and of stress relaxation. The D.S.A. is attributed to interstitial atoms, and is increased in magnitude by the presence of silicon, probably due to lattice distortions resulting from silicon-interstitial atom pairs; the temperature of dynamic strain ageing is reduced by increases in silicon or oxygen content. The powerful solid solution strengthening role of silicon at elevated temperatures may arise from the intensification of the interstitial strain ageing effect by the silicon.
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