Abstract
The structure and mechanical properties of 2036 alloy deformed 30% at 423 and 473 K and aged at 423 K have been studied. The main precipitating phase was θ′; however, θ-phase was also observed in specimens deformed at 473 K and aged to peak at 423 K which results in a lower level of strength. A model developed by Kocks and Mulford using thermal activation theory to identify strengthening mechanisms in alloys was used to establish obstacles to flow in this alloy. It was found that in solution-treated and aged-to-peak specimens, the obstacles are θ′ precipitate particles which are athermal in nature. In thermomechanically treated specimens, they were uniformly distributed dislocations and θ′ precipitates. Since dislocations were stabilized by the precipitates, they also acted as athermal obstacles.
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