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Instruments / Technical Area	Publication Details	Published	Actions
I13-2-Diamond Manchester Imaging	Estimation of environment-induced crack growth rate as a function of stress intensity factors generated during slow strain rate testing of aluminum alloys N. J. Henry Holroyd , Timothy L. Burnett , Benjamin C. Palmer , John J. Lewandowski Corrosion Reviews DOI: 10.1515/corrrev-2019-0031 Diamond Proposal Number(s): [18165] Open Access Show Abstract ▼ Abstract: In this contribution, we introduce a simple approach to quickly estimate the environment-induced crack velocity (CV) as a function of the calculated applied stress intensity factor (K) developed during the slow strain rate testing of aluminum alloys exposed to aqueous or humid air-type environments. The CV-K behavior for a commercial aluminum-magnesium alloy, AA5083-H131, sensitized and pre-exposed to a 0.6 m NaCl solution has been estimated from slow strain rate test data. The predicted threshold K and crack velocities match recently published data for the same alloy in similarly sensitized conditions where the CV-K data were obtained using state-of-the-art fracture mechanics-based testing.	Jun 2019
I13-2-Diamond Manchester Imaging	Initiation and short crack growth behaviour of environmentally induced cracks in AA5083 H131 investigated across time and length scales Visweswara C. Gudla , Alistair Garner , Malte Storm , Parmesh Gajjar , James Carr , Benjamin C. Palmer , John J. Lewandowski , Philip J. Withers , N. J. Henry Holroyd , Timothy L. Burnett Corrosion Reviews 0 DOI: 10.1515/corrrev-2019-0044 Diamond Proposal Number(s): [18165] Open Access Show Abstract ▼ Abstract: Environmentally induced cracking (EIC) in a sensitized high-strength AA5083 H131 alloy has been investigated using time-lapse synchrotron X-ray computed tomography combined with post-mortem correlative characterization. Small corrosion features deliberately introduced in a pre-exposure step were found to be the site of initiation for over 95% of the 44 EIC cracks that developed under slow strain rate testing. Detailed analysis using three-dimensional electron backscatter diffraction and energy-dispersive spectroscopy analysis of a single crack confirmed the intergranular nature of the cracks from the start and that the pre-exposure corrosion was associated with an α-AlFeMnSi particle cluster. It also appears that several cracks may have initiated at this site, which later coalesced to form the 300-μm-long crack that ultimately developed. Of further note is the fact that initiation of the EIC cracks across the sample started below the yield strength and continued beyond the ultimate tensile strength. The most rapid crack propagation occurred during sample extension following a period of fixed displacement.	Jun 2019

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