Grain morphology reconstruction of crystalline materials from Laue three-dimensional neutron diffraction tomography

Abstract

the macroscopic properties of advanced engineering and functional materials are highly dependent on their overall grain orientation distribution, size, and morphology. Here we present Laue 3D neutron diffraction tomography providing reconstructions of the grains constituting a coarse-grained polycrystalline material. Reconstructions of the grain morphology of a highly pure Fe cylinder and a Cu cube sample are presented. A total number of 23 and 9 grains from the Fe and Cu samples, respectively, were indexed and reconstructed. Validation of the grain morphological reconstruction is performed by post-mortem EBSD of the Cu specimen.

Neutron and Synchrotron Imaging Studies of Preservation State of Metal of Cultural Heritage Objects

“…This attenuation is due to the fact that, at a certain angular position, a single crystal grain of the metal enters the reflecting position, and a significant part of the beam intensity is removed from the image formation. This diffraction contrast was used, in a more complicated way, for the reconstruction of grain morphology in the polycrysrtalline materials [11]. This effect can also be detected in the following way: considering a sequence of projections in a certain range of angles (up to 20 • ), and using the ImageJ program function, one can construct a map of the minimum brightness values of these projections.…”

An integral framework for computational thermo-elastic homogenization of polycrystalline materials

“…The accompanying boundary conditions are given in Eqs. (5)(6), where τ now represents an ordering parameter used to express a quasi-static evolution of the boundary loading terms, while initial conditions are no relevant for stationary problems. No external force or heat volume sources are considered, although they could be numerically treated as in Ref.…”

“…The capability to understand, model, interpret and explain materials behaviours has been gradually extended, evolving from simple phenomenological modelling at a selected application scale to physically based modelling spanning several scales, and even including ab initio, or first principles, tools in the most inclusive applications [2]. Such evolution has been underpinned both by remarkable developments in experimental multiscale characterization of materials [3,4,5,6], which make now experimentally accessible even complex phenomena at the smallest scales, and by the rapid technological progress and consequent increased affordability and availability of high performance computing [7], which has allowed the inclusion of a broader range of morphological and constitutive features in the materials model representation, making it possible to simulate complex, interacting nonlinear phenomena, e.g. damage and cracking [8,9].…”

Characterization of Pharmaceutical Tablets by X-ray Tomography

“…While X-ray photons interact with electrons, neutrons interact with the atomic nucleus. Neutron tomography can be carried out by characterizing the neutron absorption [ 74 ], scattering cross-section [ 75 , 76 ], local diffraction [ 77 ] as well as by the phase change [ 78 ]. Neutrons are highly sensitive to light elements such as H, N, C, O and are attenuated very efficiently by proton-rich compounds such as water [ 79 ], and can be suitable to characterize in situ dissolution/disintegration of tablets.…”