Summary
The potential of DSC in suggesting modifications of thermal treatments of Al alloys to increase mechanical properties is described. Significant results can be obtained from calorimetric evolution after a series of annealings, even without a direct observation of the microstructure. The role of a reference baseline is discussed. The Guinier-Preston (GP) zones formation, dissolution or transformation is followed, and their relevance for the microhardness increase is shown, for an AlZnMg alloy of technical interest. Multi-stage thermal treatments have been confirmed to be beneficial. A secondary precipitation occurs at room temperature after annealing at temperatures at which primary precipitation is almost complete.
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Riontino, G., Ferro, G., Lussana, D. et al. The use of DSC in describing the structure evolution of an AlZnMg alloy. J Therm Anal Calorim 82, 83–87 (2005). https://doi.org/10.1007/s10973-005-0845-9
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DOI: https://doi.org/10.1007/s10973-005-0845-9