Influence of delay step conditions between quenching and aging on the precipitation mechanisms in the alloy AlZnMg AA7028 aging process

摘要

Amongst precipitation-hardened alloys, the Al-Zn-Mg system includes the aluminium alloys with higher-strength. The relatively high solubility of Zn and Mg in ahuninium makes it possible to produce a high densiiy of precipitates, which results in a higher strength increase. AlZnh4g low copper or copper free alloys have the advantage of being easily weldable and, morever, they hard significatively at room temperature with respect to other weldable ahnninium alloys [1].