Control of precipitation during heat treatments based on DSC experiments

Schumacher, Philipp, Pogatscher, Stefan, Starink, Marco J., Keßler, Olaf, Schick, Christoph, Mohles, Volker and Milkereit, Benjamin (2015) Control of precipitation during heat treatments based on DSC experiments. In Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015. International Conference on Solid-Solid Phase Transformations in Inorganic Materials. pp. 699-706 .

Abstract

Precipitation in Al-Si alloys during cooling from solution annealing was investigated with advanced DSC techniques in a wide cooling rate range (2 K/s-0.0001 K/s). Microstructural analyses show that Si particles of different shape and size can precipitate during cooling. The dependence of precipitation enthalpy on cooling rate and temperature is modelled, providing a consistent physical description of precipitate volume fraction and solute Si amount during cooling. This allows control of precipitation via precise heat treatments and thus allows generation of well-defined microstructural states. Thereby, samples having an equal amount of solute Si but different precipitation states could be tested in order to investigate their influence on the mechanical behaviour. A big advantage of this method is that the strengthening contribution of precipitates can be determined without the need to assume any - potentially inaccurate - superposition law between particle and solute strengthening.

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