I annealed AlCu alloy in salt bath at about 530° C for 30 mins and then quenched it in the water of 20° C. I have left the samples for about 2 months and after that there is no change in the harness of the sample.
Hi, Razieh Fazeli
Have you checked microstructure, hardness or electrical conductivity to evidence supersaturation?
At a glance, 30 mins exposure is minor for dissolving Cu.
Longer annealing time up to 8 h depending on the product u study must help.
Dear Razieh Fazeli ;
The hardness test for AlCu alloy after aging should be at a high temperature, about 190 C, as in Table 6 in the reference attached; so it can be detected.
Effect of Deformation and Aging on Properties of Al-4.1%Cu-1.4%Mg Aluminum Alloy
https://www.hindawi.com/journals/isrn/2013/902970/
I agree with Dr. Murat Tiryakioḡlu as asking for the percent of copper in the alloy since the precipitation hardening will not occur when the concentration of the Cu is more than 5%, as the concentration of Cu must be less than the maximum solubility limit of Cu in Al . This will lead for adequate driving force for Cu solute diffusion and mass transfer for Al2Cu intermetallic phase precipitation.
Best regards...
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