The effect of predeformation on the β″ and β′ precipitates and the role of Q′ phase in an Al-Mg-Si alloy; AA6022

The precipitation of metastable phases during differential scanning calorimetry experiments of cold deformed AA6022 is investigated by means of transmission electron microscopy. It is found that β″ precipitates are replaced by β′ and Q′ in the predeformed samples. The results show that at higher temperatures only Q′ precipitates are present in the microstructure of the predeformed samples.