7075 aluminum plate will be aging treatment before use, after aging treatment of 7075 aluminum plate hardness and strength will become high, that is not the longer the aging, the higher the hardness and strength?Next, 7075 aluminum plate manufacturers will reveal the secret to you.

The curve of vickers hardness changing with aging time after artificial aging treatment at different temperatures shows that the hardness value of 7075 aluminum plate increases gradually with the extension of aging time. When reaching the peak value, the hardness value decreases rapidly first and then decreases slowly.At the beginning, the hardness of 7075 aluminum plate increases slowly because it is in the inoculation period. During the inoculation period, the microstructure of 7075 aluminum plate changes very little.During the aging treatment of 7075 aluminum plate, the hardness of 7075 aluminum plate gradually increases with the extension of time.The R 'phase is precipitated in the phase which is about to reach the maximum value. The R' phase can effectively prevent the dislocation slip of the base plane. When the hardness reaches the peak, no new phase is precipitated in the 7075 aluminum plate.However, the phase transition continues, and the R 'phases are largely transformed into the metastable R, phase;While the metastable phase R will change into equilibrium phase R in the original position, both metastable phase R and equilibrium phase R will lead to the decrease of the hardness of 7075 aluminum plate.

Therefore, it can be concluded that the higher the aging temperature of 7075 aluminum plate, the shorter the time for the hardness of 7075 aluminum plate to reach the peak, the lower the peak.In addition, the larger the temperature is, the larger the growth trend of the precipitated phase is, which is not conducive to the dispersion distribution of particles, and the microhardness of the alloy decreases.After observation and comparison, the hardness value of 7075 aluminum plate at 22s 0C x 12h basically reached the peak value of hardness of 22s℃ aging, and the time to reach the peak value was shorter than that of 200℃ aging treatment, and the energy consumption was lower than that of 2S0 ℃ aging treatment, and the hardness value was larger. Therefore, artificial aging 22s 0C x 12h was selected as the optimal aging treatment scheme.

The above is about the effect of the longer the aging of 7075 aluminum plate on hardness and strength. If you want to consult the price of 7075 aluminum plate, you can consult us online.