Four-Dimensional Morphological Evolution of an Aluminum Silicon Alloy Using Propagation-Based Phase Contrast X-ray Tomographic Microscopy

Gulsoy, Emine Begum; Shahani, Ashwin J.; Gibbs, John W.; Fife, Julie L.; Voorhees, Peter W.

doi:10.2320/matertrans.m2013225

Cited by 11 publications

(16 citation statements)

References 16 publications

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“…This suggests the presence of {1 1 1} facets in the solid, that do not evolve as fast as other orientations, as previously observed in Refs. [9,16,21,26]. In other words, the broad faces of a given particle, suggested to be of {1 1 1} type, appear to be growing much slower with respect to the edges of the particle, giving rise to the observed structural changes [26].…”

Section: D Reconstructionsmentioning

confidence: 94%

“…[26,27] for experimental details. The 4D propagation-based PCT experiment was conducted ex situ at the TOmographic Microscopy and Coherent rAdiology experimenTs (TOMCAT) beamline of the Swiss Light Source (Paul Scherrer Institut, Switzerland) [29].…”

Section: Experimental Methodologymentioning

confidence: 99%

“…X-ray tomography (XRT) is a nondestructive characterization method, where it is possible to follow the evolution of the 3D microstructure as a function of time [24,25]. In particular, X-ray phase contrast tomography (PCT), where the phase is retrieved in the near-field regime, enables the study of systems consisting of elements with similar atomic numbers, such as in an Al-Si alloy [26,27]. Thus, we probe the microstructural evolution of primary Si particles in an Al-29.9wt%Si alloy during isothermal coarsening via 4D PCT.…”

Section: Introductionmentioning

confidence: 99%

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The dynamics of coarsening in highly anisotropic systems: Si particles in Al–Si liquids

et al. 2015

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a b s t r a c tThe coarsening process of an Al-29.9wt%Si alloy is studied using four-dimensional phase contrast X-ray tomography. This alloy is composed of highly anisotropic, primary Si particles in an eutectic matrix. We analyze the morphology of the primary Si particles during coarsening by determining the interface normal distribution and the interface shape distribution. The inverse surface area per unit volume increases with the cube root of time despite the lack of microstructural self-similarity and highly anisotropic particle morphology. More specifically, over the time frame of the experiments, the Si particles evolve from mostly faceted domains to a more isotropic structure that is not given by the Wulff shape of the crystal. These trends can be rationalized by the presence of twin defects that intersect particle edges and that may provide the kink sites necessary for interfacial propagation, thus leading to a more isotropic structure. While in many cases the interfacial velocity of Si solid-liquid interfaces is highly anisotropic, the presence of many defects leads to a highly mobile interface and diffusion-limited coarsening.

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Section: D Reconstructionsmentioning

confidence: 94%

Section: Experimental Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The dynamics of coarsening in highly anisotropic systems: Si particles in Al–Si liquids

et al. 2015

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“…[16] for experimental details. The 4D propagation-based phase contrast tomography experiment was conducted ex situ at the TOmographic Microscopy and Coherent rAdiology ExperimenTs (TOMCAT) beamline of the Swiss Light Source (Paul Scherrer Institut, Switzerland) [17].…”

Section: Experimental Methodologymentioning

confidence: 99%

“…For instance, Ref. [16] demonstrated, qualitatively, that the highly anisotropic Si laths do not evolve through a series of equilibrium Wulff shapes, and that there are interfaces with low mobility in the structure. For quantitative microstructural characterization of the coarsening morphologies in Fig.…”

Section: D Reconstructionmentioning

confidence: 99%

Integrated approach to the data processing of four-dimensional datasets from phase-contrast x-ray tomography

Shahani¹,

Gulsoy²,

Gibbs³

et al. 2014

Opt. Express

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Phase contrast X-ray tomography (PCT) enables the study of systems consisting of elements with similar atomic numbers. Processing datasets acquired using PCT is nontrivial because of the low-pass characteristics of the commonly used single-image phase retrieval algorithm. In this study, we introduce an image processing methodology that simultaneously utilizes both phase and attenuation components of an image obtained at a single detector distance. This novel method, combined with regularized Perona-Malik filter and bias-corrected fuzzy C-means algorithm, allows for automated segmentation of data acquired through four-dimensional PCT. Using this integrated approach, the three-dimensional coarsening morphology of an Aluminum-29.9wt% Silicon alloy can be analyzed.

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Materials, Data, and Informatics

Kalidindi¹

2015

Hierarchical Materials Informatics

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Four-Dimensional Morphological Evolution of an Aluminum Silicon Alloy Using Propagation-Based Phase Contrast X-ray Tomographic Microscopy

Cited by 11 publications

References 16 publications

The dynamics of coarsening in highly anisotropic systems: Si particles in Al–Si liquids

The dynamics of coarsening in highly anisotropic systems: Si particles in Al–Si liquids

Integrated approach to the data processing of four-dimensional datasets from phase-contrast x-ray tomography

Materials, Data, and Informatics

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