2023
DOI: 10.5006/4336
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Mechanisms of Environmentally Induced Crack Initiation in Humid Air for New-Generation Al-Zn-Mg-Cu Alloys

Abstract: Recent experience has shown that new-generation 7xxx-series alloys, that have a high Zn content and Zn/Mg ratios, have a greater susceptibility to Hydrogen-Environmental Induced Cracking (H-EIC) on exposure to humid air than more established materials, like AA7050. In this study we report new evidence of the EIC initiation and crack growth behaviour of two new generation alloys, AA7085 and AA7449, when exposed to 50% humidity. In-situ, time lapse, optical imaging over large areas has enabled the exact initiati… Show more

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