Abstract
An effect of the solutioning conditions on the aging response (precipitation, age hardening) in a β type titanium alloy, Ti-15V-3Cr-3Sn-3Al, is examined. The aging response is strongly affected by the solutioning conditions and closely related to the concentration of quenched-in vacancies, which is a function of the quenching temperature and the density of vacancy sinks such as β grain boundaries, dislocations, etc. For example, the ω (≤250 o C) and the α (300-350 o C) precipitations and the age hardening are greatly accelerated in the specimens in which a large amount of quenched-in vacancies are contained, i.e. the specimens quenched from high temperatures and/or with a small density of vacancy sinks
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