In situ observation of environmentally assisted crack initiation and short crack growth behaviour of new-generation 7xxx series alloys in humid air

Ryan Euesden; Yasser Al Aboura; Alistair Garner; Thomas Jailin; Cameron Grant; Zak Barrett; Christian  Engel; Pratheek Shanthraj; Nigel Holroyd; Phil Prangnell; Timothy Burnett

doi:10.1016/j.corsci.2023.111051

In situ observation of environmentally assisted crack initiation and short crack growth behaviour of new-generation 7xxx series alloys in humid air

Ryan Euesden, Yasser Al Aboura, Alistair Garner, Thomas Jailin, Cameron Grant, Zak Barrett, Christian Engel, Pratheek Shanthraj, Nigel Holroyd, Phil Prangnell, Timothy Burnett (Corresponding)

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

Abstract

Large area, time resolved, in-situ optical scanning of constant displacement (four-point bend) tests has been used to monitor the environmentally assisted cracking (EAC) initiation and crack growth behaviour of AA7085 and AA7449 T7651 thick plate materials, exposed to warm-humid air (50 % RH & 70 °C). Subsequent fractography has revealed the dominant initiation sites originating at surface connected gas pore clusters, in combination with reactive Mg-containing constituent intermetallic compounds co-located on grain boundaries. Cracks were also shown to grow at stress intensities substantially below the KIEAC threshold measured via DCB testing, which should not therefore be taken as a limit below which EAC cannot occur.

Original language	English
Journal	Corrosion Science
Early online date	16 Feb 2023
DOIs	https://doi.org/10.1016/j.corsci.2023.111051
Publication status	Published - 15 May 2023

Keywords

Environmentally Assisted Cracking (EAC)
High strength aluminium alloys
Hydrogen Embrittlement
Crack Initiation

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10.1016/j.corsci.2023.111051Licence: CC BY

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title = "In situ observation of environmentally assisted crack initiation and short crack growth behaviour of new-generation 7xxx series alloys in humid air",

abstract = "Large area, time resolved, in-situ optical scanning of constant displacement (four-point bend) tests has been used to monitor the environmentally assisted cracking (EAC) initiation and crack growth behaviour of AA7085 and AA7449 T7651 thick plate materials, exposed to warm-humid air (50 % RH & 70 °C). Subsequent fractography has revealed the dominant initiation sites originating at surface connected gas pore clusters, in combination with reactive Mg-containing constituent intermetallic compounds co-located on grain boundaries. Cracks were also shown to grow at stress intensities substantially below the KIEAC threshold measured via DCB testing, which should not therefore be taken as a limit below which EAC cannot occur.",

keywords = "Environmentally Assisted Cracking (EAC), High strength aluminium alloys, Hydrogen Embrittlement, Crack Initiation",

author = "Ryan Euesden and {Al Aboura}, Yasser and Alistair Garner and Thomas Jailin and Cameron Grant and Zak Barrett and Christian Engel and Pratheek Shanthraj and Nigel Holroyd and Phil Prangnell and Timothy Burnett",

year = "2023",

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day = "15",

doi = "10.1016/j.corsci.2023.111051",

language = "English",

journal = "Corrosion Science",

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TY - JOUR

T1 - In situ observation of environmentally assisted crack initiation and short crack growth behaviour of new-generation 7xxx series alloys in humid air

AU - Euesden, Ryan

AU - Al Aboura, Yasser

AU - Garner, Alistair

AU - Jailin, Thomas

AU - Grant, Cameron

AU - Barrett, Zak

AU - Engel, Christian

AU - Shanthraj, Pratheek

AU - Holroyd, Nigel

AU - Prangnell, Phil

A2 - Burnett, Timothy

PY - 2023/5/15

Y1 - 2023/5/15

N2 - Large area, time resolved, in-situ optical scanning of constant displacement (four-point bend) tests has been used to monitor the environmentally assisted cracking (EAC) initiation and crack growth behaviour of AA7085 and AA7449 T7651 thick plate materials, exposed to warm-humid air (50 % RH & 70 °C). Subsequent fractography has revealed the dominant initiation sites originating at surface connected gas pore clusters, in combination with reactive Mg-containing constituent intermetallic compounds co-located on grain boundaries. Cracks were also shown to grow at stress intensities substantially below the KIEAC threshold measured via DCB testing, which should not therefore be taken as a limit below which EAC cannot occur.

AB - Large area, time resolved, in-situ optical scanning of constant displacement (four-point bend) tests has been used to monitor the environmentally assisted cracking (EAC) initiation and crack growth behaviour of AA7085 and AA7449 T7651 thick plate materials, exposed to warm-humid air (50 % RH & 70 °C). Subsequent fractography has revealed the dominant initiation sites originating at surface connected gas pore clusters, in combination with reactive Mg-containing constituent intermetallic compounds co-located on grain boundaries. Cracks were also shown to grow at stress intensities substantially below the KIEAC threshold measured via DCB testing, which should not therefore be taken as a limit below which EAC cannot occur.

KW - Environmentally Assisted Cracking (EAC)

KW - High strength aluminium alloys

KW - Hydrogen Embrittlement

KW - Crack Initiation

U2 - 10.1016/j.corsci.2023.111051

DO - 10.1016/j.corsci.2023.111051

M3 - Article

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

ER -

In situ observation of environmentally assisted crack initiation and short crack growth behaviour of new-generation 7xxx series alloys in humid air

Abstract

Keywords

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