Does it means that the precipitates are already present in the matrix or it tells information about overaging?in Al-Cu system
I haven't worked on Inorganic complex. But previous work with DSC must be helpful. https://doi.org/10.1016/j.orgel.2017.08.008
https://doi.org/10.1016/j.synthmet.2019.02.015
As usual in questions posted on RG, there is no information from which we can propose an explanation....
Endothermic peaks are usual because fusion, most phase changes, etc. are endothermic.
Here I have attached the DSC graph.
below zero is exothermic and above it is endothermic.
It seems that there are no peak at all, so it is just a thermal exchange (due to Cp?).
Did you check the baseline, using two identical samples in the reference and measuring cells ? or two empty celles ? Alumina is often used as reference.
https://www.researchgate.net/figure/a-DSC-curves-of-solution-treated-Al-Cu-Al-CuMg-and-Al-Cu-Mg-Ag-alloys-with-a-medium_fig2_335479226,kindly check this link.
https://www.researchgate.net/publication/222152985_Precipitation_behavior_of_an_Al-Cu_alloy_during_isothermal_aging_at_low_temperatures,u can follow this link.
Jean-François Gal Yes I did caliberated the instrument before with empty crucibles.
@FaraedSalman thanks I will check that
Yes, we can see a peak at about 150 °. In fact I don't know well the problem of alloys, I am accustomed to organic compounds ans reactions.
It depends on the composition of the sample. There are too many options.
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