Structural parameters of 7020 alloy after heat treatment simulating the welding process

Microstructure and Fatigue Properties of AlZn6Mg0.8Zr Alloy Subjected to Low-Temperature Thermomechanical Processing

“…The microanalysis of chemical composition (using SEM) of dark points revealed mainly that these are Fe-rich phases, additionally suggesting that these are primary phases produced during casting process. The same observations were noted recently by Lech-Grega et al [24], in the case of the 7020 aluminium alloy. The phases they observed contained Fe, Mn and Cr.…”

The influence of heat treatments on the microstructure and the mechanical properties in commercial 7020 alloys

“…12, Table 4). Black arrows show max ) and the ultimate tensile strength (UTS) of the artificial aged 7020 alloy, analysed by Lech-Grega et al [2], to indicate the influence The results of the samples in the peak aged condition of strand A and B (Table 4) show no differences within the error bars. he results of the samples in the peak aged condition of strand A and B (Table 4) no differences within the error bars.…”

“…The 7020 alloy belongs to the hardenable Al-Zn-Mg-(Cu)-based alloys, which are the group of the high strength aluminium alloys and are used for some structural applications in the aircraft (components in wings and ailerons) and automotive industry (bumper structures). However, the drawback of the 7xxx alloys is their low ductility with an elongation at fracture of about only 11% [2]. The motivation of this work is to increase the ductility of the 7020 alloy to make it competitive to the 6xxx alloys maintaining the high strength.…”

“…In addition the results of mechanical properties investigated by compression and tensile tests will be reported. The adjustment of the age hardening parameters of the extruded 7020 alloy enables the generation of required elongation at fracture at higher strength compared to the mechanical properties of a casted 7020 alloy known from the literature [2].…”

Effect of the Number of Welding Repairs with GTAW on the Mechanical Behavior of AA7020 Aluminum Alloy Welded Joints

“…The region between 20 and 25 mm shows a reduction in hardness due to heat cycles, but does not show hardening by natural aging after 30 days, and shows the lowest hardness in the HAZ. In heat-treatable aluminum alloys, hardness depends on the type, size, and volumetric fraction of the precipitates; [12][13][14] different temperatures generate formation, dissolution, or growth of precipitates. During the welding process, there are isotherms along the coupon and the peak temperature decreases with increasing the distance from the fusion line.…”