The Influence of Nickel and Tin Additives on the Microstructural and Mechanical Properties of Al-Zn-Mg-Cu Alloys

Table 2

The heat treatment steps of studied alloys after the extrusion process.

Number of treatment	Type	Details of treatment
1	Homogenizing	450°C for 2 h + 470°C for 24 h + 480°C for 0.5 h
2	Peak ageing (T6)	120°C for 24 h (peak ageing)
3	Retrogression and reaging (RRA)	120°C for 24 h (peak ageing) + 180°C for 0.5 h (retrogression) + 120°C for 24 h (reageing)