<i>In situ</i>lattice strain mapping during tensile loading using the neutron transmission and diffraction methods

Iwase, Kenji; Sato, Hirotaka; Harjo, Stefanus; Kamiyama, Takashi; Ito, Takayoshi; Takata, Shigeo; Aizawa, Katsuo; Kiyanagi, Yoshiaki

doi:10.1107/s0021889812000076

Cited by 35 publications

(29 citation statements)

References 13 publications

(12 reference statements)

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“…[91][92][93] Whether it is for application in experiments at the CANS itself or as a part of an instrument at a larger neutron sources, a CANS is definitely a suitable environment for testing new detector concepts. For instance, a number of detector technologies were developed over the years at HUNS, including 2D position-sensitive neutron detectors, [94][95][96][97][98][99] a wavelength-shifting fiber detector, [99] direct-readout pixel-type detectors, [98,100] a boron-type GEM detector, [101] and a neutron image intensifier. [101] A neutron resonance absorption spectroscopy system is also available at HUNS [102] which uses lithium-glass scintillator pixel-type detectors for neutron absorption spectrum recording and BaF2 scintillation detectors for prompt gamma-ray measurements.…”

Section: Neutron Detectorsmentioning

confidence: 99%

Research opportunities with compact accelerator-driven neutron sources

et al. 2016

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Since the discovery of the neutron in 1934 neutron beams have been used in a very broad range of applications, As an aging fleet of nuclear reactor sources is retired the use of compact accelerator-driven neutron sources (CANS) are becoming more prevalent. CANS are playing a significant and expanding role in research and development in science and engineering, as well as in education and training. In the realm of multidisciplinary applications, CANS offer opportunities over a wide range of technical utilization, from interrogation of civil structures to medical therapy to cultural heritage study. This paper aims to provide the first comprehensive overview of the history, current status of operation, and ongoing development of CANS worldwide. The basic physics and engineering regarding neutron production by accelerators, target-moderator systems, and beam line instrumentation are introduced, followed by an extensive discussion of various evolving applications currently exploited at CANS.

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Section: Neutron Detectorsmentioning

confidence: 99%

Research opportunities with compact accelerator-driven neutron sources

et al. 2016

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“…This technique enables the study of spatially resolved lattice strain [23,24], crystallographic grain orientation [25][26][27], and phase distribution [17,28]. Theoretical and mathematical approaches to fit and interpret the transmission spectra have been proposed and applied to several engineering materials [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Crystallographic Structures Using Bragg-Edge Neutron Imaging at the Spallation Neutron Source

et al. 2017

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Over the past decade, wavelength-dependent neutron radiography, also known as Bragg-edge imaging, has been employed as a non-destructive bulk characterization method due to its sensitivity to coherent elastic neutron scattering that is associated with crystalline structures. Several analysis approaches have been developed to quantitatively determine crystalline orientation, lattice strain, and phase distribution. In this study, we report a systematic investigation of the crystal structures of metallic materials (such as selected textureless powder samples and additively manufactured (AM) Inconel 718 samples), using Bragg-edge imaging at the Oak Ridge National Laboratory (ORNL) Spallation Neutron Source (SNS). Firstly, we have implemented a phenomenological Gaussian-based fitting in a Python-based computer called iBeatles. Secondly, we have developed a model-based approach to analyze Bragg-edge transmission spectra, which allows quantitative determination of the crystallographic attributes. Moreover, neutron diffraction measurements were carried out to validate the Bragg-edge analytical methods. These results demonstrate that the microstructural complexity (in this case, texture) plays a key role in determining the crystallographic parameters (lattice constant or interplanar spacing), which implies that the Bragg-edge image analysis methods must be carefully selected based on the material structures.

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“…[1][2][3][4][5][6][7][8][9]. RITS is based on the idea of the Rietveld analysis method [10] for X-ray/neutron powder diffractometry.…”

Section: Profile Calculation Model For Bragg-edge Transmission Spectrmentioning

confidence: 99%

“…On the other hand, in this section, simultaneous imaging of macro-strain and micro-strain [6] and the comparisons between Bragg-edge neutron transmission and neutron diffraction [3,8] are presented. Figure 11 shows a photograph of samples.…”

Section: Imaging Of Crystal Lattice Plane Spacing (Macro-strain) and mentioning

confidence: 99%

Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

Sato

2017

J. Imaging

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Current status of Bragg-edge/dip neutron transmission analysis/imaging methods is presented. The method can visualize real-space distributions of bulk crystallographic information in a crystalline material over a large area (~10 cm) with high spatial resolution (~100 µm). Furthermore, by using suitable spectrum analysis methods for wavelength-dependent neutron transmission data, quantitative visualization of the crystallographic information can be achieved. For example, crystallographic texture imaging, crystallite size imaging and crystalline phase imaging with texture/extinction corrections are carried out by the Rietveld-type (wide wavelength bandwidth) profile fitting analysis code, RITS (Rietveld Imaging of Transmission Spectra). By using the single Bragg-edge analysis mode of RITS, evaluations of crystal lattice plane spacing (d-spacing) relating to macro-strain and d-spacing distribution's FWHM (full width at half maximum) relating to micro-strain can be achieved. Macro-strain tomography is performed by a new conceptual CT (computed tomography) image reconstruction algorithm, the tensor CT method. Crystalline grains and their orientations are visualized by a fast determination method of grain orientation for Bragg-dip neutron transmission spectrum. In this paper, these imaging examples with the spectrum analysis methods and the reliabilities evaluated by optical/electron microscope and X-ray/neutron diffraction, are presented. In addition, the status at compact accelerator driven pulsed neutron sources is also presented.

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In situlattice strain mapping during tensile loading using the neutron transmission and diffraction methods

Cited by 35 publications

References 13 publications

Research opportunities with compact accelerator-driven neutron sources

Research opportunities with compact accelerator-driven neutron sources

Characterization of Crystallographic Structures Using Bragg-Edge Neutron Imaging at the Spallation Neutron Source

Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

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