An optimized single-crystal to polycrystal model of the neutron transmission of textured polycrystalline materials

Malamud, Florencia; Santisteban, J.R.; Alvarez, M.G.; Busi, Matteo; Polatidis, Efthymios; Ströbl, Markus

doi:10.1107/s1600576722011323

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…These approaches have been explored in previous works, such as Ref. [10][11][12]. In this study, as well as in Ref.…”

Section: Direct Evaluation Ofmentioning

confidence: 91%

A new method to obtain the crystallographic texture of polycrystalline materials in Bragg edge imaging experiments

Alvarez,

Malamud

2023

J. Phys.: Conf. Ser.

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In polycrystalline materials, the shape and height of Bragg edges observed in wavelength resolved neutron transmission experiments depend on the crystallographic texture. Previous works have proved the capacity of actual models to predict the transmission spectra once the texture of the material is known. In this work, we summarize the recent advances done trying to obtain information of the texture from the experimental transmission data. The basis of this method resides in a compact expression of the coherent elastic cross section in terms of the Fourier coefficients of the orientation distribution function, which describes the crystallographic texture. The validity of this method is restricted to the applicability of the kinematic approximation of diffraction (polycrystalline materials with grain sizes below 10μm) and to materials with spatially uniform texture.

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“…These approaches have been explored in previous works, such as Ref. [10][11][12]. In this study, as well as in Ref.…”

Section: Direct Evaluation Ofmentioning

confidence: 91%

A new method to obtain the crystallographic texture of polycrystalline materials in Bragg edge imaging experiments

Alvarez,

Malamud

2023

J. Phys.: Conf. Ser.

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Operando lateral state-of-charge inhomogeneity mapping via wavelength-resolved neutron imaging

Carreón Ruiz,

Malamud,

Lee

et al. 2024

Materials Today Energy

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Determination of crystallographic texture in polycrystalline materials from wavelength-resolved neutron transmission experiments: application to high-symmetry crystals

Vicente Alvarez,

Malamud,

Santisteban

2023

J Appl Cryst

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Wavelength-resolved neutron transmission experiments are useful for characterizing the microstructure of macroscopic specimens with 2D spatial resolution perpendicular to the beam direction. The crystallographic texture can affect the neutron transmission in the thermal neutron energy range, which manifests as changes in the shape and height of Bragg edges as a function of neutron wavelength. Models have been proposed to predict the transmission of textured polycrystalline materials from knowledge of the material texture and have proved to accurately predict the observed transmission data. In recent work, a novel method was described and tested for obtaining texture integral parameters from the combined analysis of transmission data measured along several directions of a specimen in a hexagonal crystal Zr alloy. However, this procedure has limitations when dealing with high-symmetry crystal structures. In this work, a generalization of such a method based on the expansion of the orientation distribution function (ODF) in symmetric generalized spherical harmonics that is applicable to all crystal and sample symmetries is presented. Using this method, the low-order Fourier coefficients of the ODF can be estimated by analyzing transmission data obtained for a reduced set of beam directions. This method was verified using a cubic Cu sample, for which transmission data were available along five different directions. Two sample symmetries were assumed to reduce the number of Fourier coefficients of the ODF. In the case of cylindrical symmetry (fiber-type texture), the results were good; but in the case of orthorhombic symmetry, some bias was observed which was attributed to the reduced number of beam directions used to perform the evaluation.

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An optimized single-crystal to polycrystal model of the neutron transmission of textured polycrystalline materials

Cited by 4 publications

References 42 publications

A new method to obtain the crystallographic texture of polycrystalline materials in Bragg edge imaging experiments

A new method to obtain the crystallographic texture of polycrystalline materials in Bragg edge imaging experiments

Operando lateral state-of-charge inhomogeneity mapping via wavelength-resolved neutron imaging

Determination of crystallographic texture in polycrystalline materials from wavelength-resolved neutron transmission experiments: application to high-symmetry crystals

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