Hydrogen-induced failure in a partially-recrystallized Al-Zn-Mg-Cu alloy with different aging conditions: Influence of deformation behavior dominated by microstructures

•Naturally-aged and peak-aged samples with shearing deformation are prone to hydrogen embrittlement.•Over-aged sample with bypassing deformation is hardly affected by hydrogen environment.•The grain boundary of recrystallized grains is prone to intergranular cracking.•Transgranular cracking tends to appear in the interior of unrecrystallized grains.•The cracking mode is the same in silicone oil and in-situ hydrogen charging environments.