Diffraction-Amalgamated Grain-boundary Tracking (DAGT) technique and its application to an aluminum alloy

LeClere, Darren J.; Kamiko, Takanobu; Mizuseki, Yasuharu; Suzuki, Yoshio; Takeuchi, Akihisa; Uesugi, Kentaro; Kobayashi, Masakazu; Toda, Hiroyuki

doi:10.1007/978-3-319-48761-8_2

Cited by 4 publications

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“…Recently Li et al, has demonstrated that samples which have undergone plastic deformation of up to 6% percent have been successfully reconstructed using a technique related to 3DXRD [45]. As a promising extension of the present GBT technique, we have attempted to combine the technique with a special X-ray diffraction experiment, before or after a given GBT experiment [46]. If this combined technique can be successfully developed, the GBT technique would offer a yet more powerful tool for elucidating still poorly understood complex deformation behaviour of polycrystalline materials, from a crystallographic point of view.…”

Section: Resultsmentioning

confidence: 99%

Grain boundary tracking: A four-dimensional visualization technique for determining grain boundary geometry via local strain mapping

et al. 2013

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A procedure for determining three-dimensional grain boundary geometry and its change under external loading is proposed for evaluating crystallographic deformation behaviours in polycrystalline materials, and its feasibility is confirmed for an aluminium alloy. X-ray microtomography technique has been combined with gallium enhanced microscopy where grains are visualised in three dimensions by decorating grain boundaries with liquid gallium. Grain boundary particles are then extracted by comparing tomographic images with and without the gallium application. Three-dimensional reconstruction of grains is achieved using a connection scheme based on triplets of non-aligned points on grain boundaries. The deformation of the closed polygonal grains is visualised by combining the above technique with 2 microstructural tracking technique where the paths of particles are reconstructed by matching each pair of particles in consecutive images. This process also enables high-density four-dimensional strain mapping by tracking particles located in grains, providing direct interpretation of localised deformation caused by interaction between neighbouring grains.

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Section: Resultsmentioning

confidence: 99%

Grain boundary tracking: A four-dimensional visualization technique for determining grain boundary geometry via local strain mapping

et al. 2013

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3D/4D analyses of damage and fracture behaviours in structural materials via synchrotron X-ray tomography

Toda

2014

Microscopy (Tokyo)

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X-ray microtomography has been utilized for the in-situ observation of various structural metals under external loading. Recent advances in X-ray microtomography provide remarkable tools to image the interior of materials. In-situ X-ray microtomography provides a unique possibility to access the 3D character of internal microstructure and its time evolution behaviours non-destructively, thereby enabling advanced techniques for measuring local strain distribution. Local strain mapping is readily enabled by processing such high-resolution tomographic images either by the particle tracking technique or the digital image correlation technique [1]. Procedures for tracking microstructural features which have been developed by the authors [2], have been applied to analyse localised deformation and damage evolution in a material [3]. Typically several tens of thousands of microstructural features, such as particles and pores, are tracked in a tomographic specimen (0.2 - 0.3 mm(3) in volume). When a sufficient number of microstructural features is dispersed in 3D space, the Delaunay tessellation algorithm is used to obtain local strain distribution. With these techniques, 3D strain fields can be measured with reasonable accuracy. Even local crack driving forces, such as local variations in the stress intensity factor, crack tip opening displacement and J integral along a crack front line, can be measured from discrete crack tip displacement fields [4]. In the present presentation, complicated crack initiation and growth behaviour and the extensive formation of micro cracks ahead of a crack tip are introduced as examples.A novel experimental method has recently been developed by amalgamating a pencil beam X-Ray diffraction (XRD) technique with the microstructural tracking technique [5]. The technique provides information about individual grain orientations and 1-micron-level grain morphologies in 3D together with high-density local strain mapping. The application of this technique to the deformation behavior of a polycrystalline aluminium alloy will be demonstrated in the presentation [6].The synchrotron-based microtomography has been mainly utilized to light materials due to their good X-ray transmission. In the present talk, the application of the synchrotron-based microtomography to steels will be also introduced. Degradation of contrast and spatial resolution due to forward scattering could be avoided by selecting appropriate experimental conditions in order to obtain superior spatial resolution close to the physical limit even in ferrous materials [7].

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Reverse 4D Materials Engineering: Its framework and recent evolution

Toda

Batres

Kuwazuru

et al. 2014

J.JILM

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Diffraction-Amalgamated Grain-boundary Tracking (DAGT) technique and its application to an aluminum alloy

Cited by 4 publications

References 4 publications

Grain boundary tracking: A four-dimensional visualization technique for determining grain boundary geometry via local strain mapping

Grain boundary tracking: A four-dimensional visualization technique for determining grain boundary geometry via local strain mapping

3D/4D analyses of damage and fracture behaviours in structural materials via synchrotron X-ray tomography

Reverse 4D Materials Engineering: Its framework and recent evolution

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