Dear Vivek,

7075 ages naturally forever so it is impossible to reach a T4 temper.  You have to be very careful with your specimens after quenching.  I suggest that you keep them in the freezer, although they will still naturally-age (very slowly). I hope this is helpful.

Good luck!

Dear Vivek,

if you plan several experiments with your material, try to do them all at the same time or at least with only short time in between. Otherwise, the natural aging can be misleading for an interpretation of the experimental results.

Regards,

A. Morasch

Hi Vivek Patel 

In the case of artificial aging or precipitation hardening, the previously solution heat treated and quenched parts are subjected to elevated temperatures (instead of room temperature) in the range of 225-375 °C over extended periods of time (4-24hours). The precipitants formed and grown here are more controlled and substantial in nature, resulting in higher mechanical properties as compared to naturally aged conditions.

Regards, 

After experimental so many stress included in the workpiece and aging is required to relieve the internal stress from work at approximately 1 .20 hr is required.

Hi Vivek

After quenching, longer natural aging means better properties in 7075 aluminum alloy, but not the best. So, it is difficult to get the best natural aging period. I hope this will help you.

Good Luck!