Effect of zn% and thermomechanical treatments on the mechanical properties of al-zn-mg alloys

Abstract EN

The aging kinetics and the coupling between plastic deformation and subsequent aging on a set of Al-Zn-Mg alloys having different Zn-content (6.33 %, 7 %, 7.5 %, and 8 %) are investigated.

These alloys are produced with an extreme care during melting, alloying and sampling where the best conditions of alloying are adopted .The response to multi thermo mechanical treatments practices are reported, where the combination between rolling practice and aging is monitored by hardness measurements, tensile, impact toughness measurements in addition to x-ray diffraction testing.

The study proves that, the zinc percent has a very important role in the precipitation hardening sequence of tested alloy ; this effect is concentrated on the speeding up the kinetics of hardening by increasing the density and stability of GP zones and μ'-phase.