Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing

Timothy Burnett; Yasser Al Aboura; Ryan Euesden; Alistair Garner; Phil Prangnell

doi:10.1016/j.corsci.2022.110161

Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing

Timothy Burnett (Corresponding), Yasser Al Aboura, Ryan Euesden, Alistair Garner, Phil Prangnell

Research output: Contribution to journal › Article › peer-review

Abstract

New generation (new-gen) 7xxx series alloys have recently been shown to have higher susceptibility to environmental assisted cracking (EAC) in humid air, compared to AA7050, in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. Initiation was favoured at sites of intermetallic particle clusters with gas pores. The higher performance of AA7050 was attributed to the difficulty of initiation in this alloy, where the grain structure, combined with an intrinsic resistance of the grain boundaries to IG-EAC, made the attainment of sustained cracking difficult.

Original language	English
Journal	Corrosion Science
DOIs	https://doi.org/10.1016/j.corsci.2022.110161
Publication status	Published - 16 Feb 2022

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10.1016/j.corsci.2022.110161

LightForm: Embedding Materials Engineering in Manufacturing with Light Alloys
Prangnell, P. (PI), Curioni, M. (CoI), Haigh, S. (CoI), Quinta Da Fonseca, J. (CoI), Robson, J. (CoI), Shanthraj, P. (CoI) & Zhou, X. (CoI)
1/10/17 → 18/10/23
Project: Research

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title = "Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing",

abstract = "New generation (new-gen) 7xxx series alloys have recently been shown to have higher susceptibility to environmental assisted cracking (EAC) in humid air, compared to AA7050, in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. Initiation was favoured at sites of intermetallic particle clusters with gas pores. The higher performance of AA7050 was attributed to the difficulty of initiation in this alloy, where the grain structure, combined with an intrinsic resistance of the grain boundaries to IG-EAC, made the attainment of sustained cracking difficult.",

author = "Timothy Burnett and {Al Aboura}, Yasser and Ryan Euesden and Alistair Garner and Phil Prangnell",

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journal = "Corrosion Science",

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T1 - Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing

AU - Al Aboura, Yasser

AU - Euesden, Ryan

AU - Garner, Alistair

AU - Prangnell, Phil

A2 - Burnett, Timothy

PY - 2022/2/16

Y1 - 2022/2/16

N2 - New generation (new-gen) 7xxx series alloys have recently been shown to have higher susceptibility to environmental assisted cracking (EAC) in humid air, compared to AA7050, in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. Initiation was favoured at sites of intermetallic particle clusters with gas pores. The higher performance of AA7050 was attributed to the difficulty of initiation in this alloy, where the grain structure, combined with an intrinsic resistance of the grain boundaries to IG-EAC, made the attainment of sustained cracking difficult.

AB - New generation (new-gen) 7xxx series alloys have recently been shown to have higher susceptibility to environmental assisted cracking (EAC) in humid air, compared to AA7050, in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. Initiation was favoured at sites of intermetallic particle clusters with gas pores. The higher performance of AA7050 was attributed to the difficulty of initiation in this alloy, where the grain structure, combined with an intrinsic resistance of the grain boundaries to IG-EAC, made the attainment of sustained cracking difficult.

U2 - 10.1016/j.corsci.2022.110161

DO - 10.1016/j.corsci.2022.110161

M3 - Article

SN - 0010-938X

JO - Corrosion Science

JF - Corrosion Science

ER -

Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing

Abstract

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LightForm: Embedding Materials Engineering in Manufacturing with Light Alloys

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