Abstract
The effect of high-temperature deformation on the kinetics of precipitation for several commercial aluminium alloys has been investigated. It has been found that mobile dislocations introduced during high-temperature deformation are efficient sinks for vacancies and retard the ageing process in spite of the additional vacancies produced through deformation. The plentiful supply of dislocations accelerates the loss of coherency of intermediate precipitates. Cold deformation after the quench, but before ageing, refines the precipitate size, which retards loss of coherency and results in improved creep strength.
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