Abstract
An effect of quenched-in vacancies on the microstructures during aging in a β titanium alloy, Ti-15V-3Cr-3Sn-3Al, is examined using two materials which are considered to have extremely different concentrations of excessive vacancies. In the material which is considered to have high concentration of quenched-in vacancies, the ω (≤250 o C) and the α (≥300 o C) phases precipitate relatively homogeneously in the β matrix regardless of dislocations in an early stage of aging, which indicates that the precipitation sites such as complex clusters of solute atoms and vacancies are formed in the β matrix in an early stage of aging. Meanwhile, in the material which is considered to have a small amount of excessive vacancies, the a phase nucleates on the vacancy sinks such as the β grain boundaries, dislocations, etc
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