Cracking evolution behaviors of lightweight materials based on in situ synchrotron X-ray tomography: A review

Luo, Ying; Wu, Shengchuan; Fu, Yucheng

doi:10.1007/s11465-018-0481-2

Cited by 14 publications

(9 citation statements)

References 57 publications

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“…Spatial and temporal resolutions of about 1 µm and 0.3 s, respectively, were achieved via performing high-resolution tomographic scans. A comprehensive literature review of imaging-based studies on hot-cracking of light alloys can be found in [ 115 ]. Phillion et al [ 116 ] precisely measured the temperature at a hot-tear, and motion of liquid into the tear using in situ radiographic imaging, using a custom-built IR heater and a bespoke loading rig.…”

Section: X-ray Imaging Of Solidification Processesmentioning

confidence: 99%

“…Spatial and temporal resolutions of about 1 µm and 0.3 s, respectively, were achieved via performing high-resolution tomographic scans. A comprehensive literature review of imaging-based studies on hot-cracking of light alloys can be found in [115]. A cooling rate of 0.1 K/s was employed, with each tomographic scan performed in about 1-2 min, (after Azeem et al, [23]).…”

Section: X-ray Imaging Of Semi-solid Deformationmentioning

confidence: 99%

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Progress on In Situ and Operando X-ray Imaging of Solidification Processes

2021

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In this review, we present an overview of significant developments in the field of in situ and operando (ISO) X-ray imaging of solidification processes. The objective of this review is to emphasize the key challenges in developing and performing in situ X-ray imaging of solidification processes, as well as to highlight important contributions that have significantly advanced the understanding of various mechanisms pertaining to microstructural evolution, defects, and semi-solid deformation of metallic alloy systems. Likewise, some of the process modifications such as electromagnetic and ultra-sound melt treatments have also been described. Finally, a discussion on the recent breakthroughs in the emerging technology of additive manufacturing, and the challenges thereof, are presented.

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Section: X-ray Imaging Of Solidification Processesmentioning

confidence: 99%

“…Spatial and temporal resolutions of about 1 µm and 0.3 s, respectively, were achieved via performing high-resolution tomographic scans. A comprehensive literature review of imaging-based studies on hot-cracking of light alloys can be found in [115]. A cooling rate of 0.1 K/s was employed, with each tomographic scan performed in about 1-2 min, (after Azeem et al, [23]).…”

Section: X-ray Imaging Of Semi-solid Deformationmentioning

confidence: 99%

Progress on In Situ and Operando X-ray Imaging of Solidification Processes

2021

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“…Thus, the behaviour of most cracks could not be observed. Crack initiation and propagation are intrinsically different in the bulk of the material than at the surface (Luo et al 2018). To overcome these limitations, this investigation aims to build on these findings by performing in situ X-ray computed microtomography (μCT).…”

Section: Introductionmentioning

confidence: 99%

3D characterisation of hydrogen environmentally assisted cracking during static loading of AA7449-T7651

et al. 2021

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In this investigation, synchrotron X-ray microtomography was used to perform 3D in situ observations of crack initiation and growth during hydrogen environmentally assisted cracking (HEAC) in tensile samples of AA7449-T7651. Two smooth tensile samples with a 1 mm diameter gauge section were held at a fixed displacement ($$\approx 30$$ ≈ 30 % of yield stress) in warm, moist air ($$\approx 76\,^\circ $$ ≈ 76 ∘ C, 73% relative humidity). The samples were then imaged repeatedly using X-ray tomography until they fractured completely. The tomograms showing the nucleation and evolution of intergranular cracks were correlated with electron microscopy fractographs. This enabled the identification of crack initiation sites and the characterisation of the crack growth behaviour relative to the microstructure. The samples were found to fracture within an environmental exposure time of 240 min. Some cracks in both samples nucleated within an exposure time of 80 min (33–40% of the total lifetime). Many cracks were found to nucleate both internally and at the sample surface. However, only superficial cracks contributed to the final fracture surface as they grew faster owing to the direct environmental exposure and the larger crack opening. HEAC occurred prominently via brittle intergranular cracking, and cracks were found to slow down when approaching grain boundary triple junctions. Additionally, crack shielding from nearby cracks and the presence of coarse Al–Cu–Fe particles at the grain boundaries were also found to temporarily reduce the crack growth rates. After prolonged crack growth, the HEAC cracks displayed ductile striations and transgranular fracture, revealing a change in the crack growth mechanism at higher stress intensity factors.

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“…In several scientific disciplines, such as materials science, biomedicine and engineering, a quantitative three-dimensional representation of a sample of interest is crucial for characterizing and understanding the underlying system (Fusseis et al, 2014;Luo et al, 2018;Midgley & Dunin-Borkowski, 2009;Rubin, 2014). Such a representation can be obtained with the experimental technique of computerized tomography (CT).…”

Section: Introductionmentioning

confidence: 99%

Improving reproducibility in synchrotron tomography using implementation-adapted filters

Ganguly¹,

Pelt²,

Gürsoy³

et al. 2021

J Synchrotron Radiat

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For reconstructing large tomographic datasets fast, filtered backprojection-type or Fourier-based algorithms are still the method of choice, as they have been for decades. These robust and computationally efficient algorithms have been integrated in a broad range of software packages. The continuous mathematical formulas used for image reconstruction in such algorithms are unambiguous. However, variations in discretization and interpolation result in quantitative differences between reconstructed images, and corresponding segmentations, obtained from different software. This hinders reproducibility of experimental results, making it difficult to ensure that results and conclusions from experiments can be reproduced at different facilities or using different software. In this paper, a way to reduce such differences by optimizing the filter used in analytical algorithms is proposed. These filters can be computed using a wrapper routine around a black-box implementation of a reconstruction algorithm, and lead to quantitatively similar reconstructions. Use cases for this approach are demonstrated by computing implementation-adapted filters for several open-source implementations and applying them to simulated phantoms and real-world data acquired at the synchrotron. Our contribution to a reproducible reconstruction step forms a building block towards a fully reproducible synchrotron tomography data processing pipeline.

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Cracking evolution behaviors of lightweight materials based on in situ synchrotron X-ray tomography: A review

Cited by 14 publications

References 57 publications

Progress on In Situ and Operando X-ray Imaging of Solidification Processes

Progress on In Situ and Operando X-ray Imaging of Solidification Processes

3D characterisation of hydrogen environmentally assisted cracking during static loading of AA7449-T7651

Improving reproducibility in synchrotron tomography using implementation-adapted filters

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