Quantitative 3D Characterization of Solidification Structure and Defect Evolution in Al Alloys

Puncreobutr, Chedtha; Lee, Peter; Hamilton, Rick; Phillion, A.B.

doi:10.1007/s11837-011-0217-9

Cited by 47 publications

(44 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2c). 55 Such in situ work has also shown that the 2 Fast imaging acquired during a high temperature tensile test of a semi-solid aluminium alloy. In this example, fast imaging is combined with digital volume correlation and image processing bringing new insights.…”

mentioning

confidence: 96%

“…In this example, fast imaging is combined with digital volume correlation and image processing bringing new insights. 55 a A virtual section during the hot tearing of partially solidified metal, b the local variation in strain determined by digital volume correlation and c the volume change of the voids between steps, which shows the internal growth of the voids in the localised deformation region results (e.g. the variation in the measured specific surface) obtained when characterising coarsening using a standard ex situ quenching and sectioning procedure are very different to what is observed under real time in situ continuous observation of the semi-solid microstructure.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Quantitative X-ray tomography

Maire¹,

Withers²

2013

International Materials Reviews

1,060

601

View full text Add to dashboard Cite

X-ray computer tomography (CT) is fast becoming an accepted tool within the materials science community for the acquisition of 3D images. Here the authors review the current state of the art as CT transforms from a qualitative diagnostic tool to a quantitative one. Our review considers first the image acquisition process, including the use of iterative reconstruction strategies suited to specific segmentation tasks and emerging methods that provide more insight (e.g. fast and high resolution imaging, crystallite (grain) imaging) than conventional attenuation based tomography. Methods and shortcomings of CT are examined for the quantification of 3D volumetric data to extract key topological parameters such as phase fractions, phase contiguity, and damage levels as well as density variations. As a non-destructive technique, CT is an ideal means of following structural development over time via time lapse sequences of 3D images (sometimes called 3D movies or 4D imaging). This includes information needed to optimise manufacturing processes, for example sintering or solidification, or to highlight the proclivity of specific degradation processes under service conditions, such as intergranular corrosion or fatigue crack growth. Besides the repeated application of static 3D image quantification to track such changes, digital volume correlation (DVC) and particle tracking (PT) methods are enabling the mapping of deformation in 3D over time. Finally the use of CT images is considered as the starting point for numerical modelling based on realistic microstructures, for example to predict flow through porous materials, the crystalline deformation of polycrystalline aggregates or the mechanical properties of composite materials.

show abstract

mentioning

confidence: 96%

mentioning

confidence: 99%

Quantitative X-ray tomography

Maire¹,

Withers²

2013

International Materials Reviews

1,060

601

View full text Add to dashboard Cite

show abstract

“…Samples were clamped between a set of purpose-built grips and loaded onto a bespoke micro-mechanical tester (P2R) (Puncreobutr et al, 2012). Tensile deformation was performed at a rate of 0.1 mm s −1 until failure.…”

Section: In Situ Synchrotron Imaging and Tensile Deformationmentioning

confidence: 99%

X-ray Tomographic Imaging of Tensile Deformation Modes of Electrospun Biodegradable Polyester Fibers

et al. 2017

View full text Add to dashboard Cite

Electrospinning allows the production of fibrous networks for tissue engineering, drug delivery, and wound healing in health care. It enables the production of constructs with large surface area and a fibrous morphology that closely resembles the extracellular matrix of many tissues. A fibrous structure not only promotes cell attachment and tissue formation but could also lead to very interesting mechanical properties. Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-co-4HB)) is a biodegradable polyester that exhibits a large (>400%) elongation before failure. In this study, synchrotron X-ray phase contrast imaging was performed during tensile deformation to failure on a non-woven fiber mat of P(3HB-co-4HB) fibers. Significant reorientation of the fibers in the straining direction was observed, followed by localized necking and eventual failure. From an original average fiber diameter of 4.3 µm, a bimodal distribution of fiber diameter (modal diameters of 1.9 and 3.7 µm) formed after tensile deformation. Extensive localized necking (thinning) of fibers between (thicker) fiber-fiber contacts was found to be the cause for non-uniform thinning of the fibers, a phenomenon that is expected but has not been observed in 3D previously. The data presented here have implications not only in tissue regeneration but for fibrous materials in general.

show abstract

“…However, compressor disks are often subjected to cold working before entering service, in order to increase resistance to fatigue [4]. This is 15 achieved by surface treatment to produce compressive residual stresses at the surface. In the past this was most commonly achieved by shot peening, where the surface of the disk is bombarded by small spherical shot with enough force to produce dimples on the component service.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography

et al. 2015

View full text Add to dashboard Cite

A first attempt at the three-dimensional evaluation of naturally initiated surface connected and internal fatigue cracks is presented. Fatigue crack initiation and growth in air and vacuum environments have been investigated through Xray microtomography in air and vacuum environments at elevated temperatures (350• C), accompanied by post-mortem electron microscopy of the fracture surfaces. In vacuum (< 10 −5 mbar), multiple internal and surface-connected crack initiation was observed, but only the surface-connected cracks grew. In contrast, fewer cracks formed in air, these were mostly surface-connected and all were observed to grow. In all instances the initiation features were associated with globular primary α. An improved fatigue life was found in vacuum, which was mostly a consequence of delayed initiation, but was also due to slower fatigue crack propagation. The non-propagation of internal cracks was taken to imply that even the good laboratory vacuum obtained here was insufficient to simulate the conditions obtained for an internal crack in a component. The crack shape evolved towards a semi-circular shape a/c = 1 in air during fatigue crack growth, whilst the vacuum cracks remained semi-elliptical (a/c 1.4). This was taken to imply that oxide-induced crack closure played a role in fatigue crack growth in air.

show abstract

Quantitative 3D Characterization of Solidification Structure and Defect Evolution in Al Alloys

Cited by 47 publications

References 29 publications

Quantitative X-ray tomography

Quantitative X-ray tomography

X-ray Tomographic Imaging of Tensile Deformation Modes of Electrospun Biodegradable Polyester Fibers

Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography

Contact Info

Product

Resources

About