|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Supersaturation and Decay: The Life of Vacancies during Precipitation
||Alexis Deschamps, De Geuser Frederic
|On-Site Speaker (Planned)
Vacancies play a fundamental role in diffusional phase transformations, mediating diffusion and therefore controlling their kinetics. Usually, precipitation occurs in a microstructure quenched from higher temperature, containing a supersaturation of vacancies. These vacancies can interact in complex ways with solute atoms, decay to structural defects (dislocations, grain boundaries) or be further produced during plastic deformation. We will show through several examples how the quantification of precipitation kinetics by in-situ advanced methods (such as Small-Angle Scattering) allows evaluating these interactions in Aluminum alloys. A first example will be given where the production of vacancies during straining explains dynamic precipitation. In a second example the evaluation of precipitation kinetics in a severely plastically deformed material will demonstrate the decay of the deformation-induced vacancy concentration. Last, we will present clustering kinetics at room, and illustrate the vastly different clustering kinetics that can occur depending on the remaining vacancy concentration.
||Planned: A print-only volume