Ageing strengthening alloy 7075 aluminium provides a number of benefits including low density, high specific strength, good toughness, easy molding, and low cost. According to numerous experts, it is widely employed in the aerospace, aviation, transportation, and other industries that need for lightweight, high-strength structural components with good corrosion resistance. As aerospace has grown in importance around the world in recent years, rivalry in this industry has also ramped up, putting additional demands on the precision and integrity of structural components for aircraft and space craft. Along with increasing machining conditions, techniques to alter the workpieces' own micro characteristics can be used to increase the machining accuracy and machined surface quality of aircraft and aerospace structural parts. AlMgZn- 7xxx series is one of the most significant and extensively researched groups of aluminium alloys in this regard. Over the years, extensive research has been done on the precipitation processes in these alloys, and the precipitation sequence has been recognized as

SSSS -> GP zones/atomic clusters -> η^,,( eta double prime⁾ -> η^, (eta prime) -> η (eta) (equilibrium phase). 

In this study different thermomechanical processing like aging and rolling on the 7075 Al alloy have performed and studies their effect on mechanical and microstructure property of 7075 Al alloy. Solution heat treatment process, aging process and cold rolling process are optimized to get better mechanical properties. Solution heat treated sample is aged at 220̊C and 140̊C for 21 hours and 24 hours respectively. Then XRD, Optical microscopy, EDX, TEM are done for phase formation and microstructure analysis. After that mechanical testing like Vickers hardness test, tensile test and fatigue fracture test are performed to study the improvement in mechanical properties of 7075 Al alloy after thermomechanical processing.