Author
João Quinta da Fonseca
Bio: João Quinta da Fonseca is an academic researcher from University of Manchester. The author has contributed to research in topics: Electron backscatter diffraction & Slip (materials science). The author has an hindex of 12, co-authored 73 publications receiving 608 citations.
Papers published on a yearly basis
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TL;DR: In this article, the deformation incompatibility between grains during polycrystalline deformation was investigated using high-resolution digital image correlation (HRDIC) supported by electron backscatter diffraction (EBSD) to study quantitatively and at the microstructural scale the accommodation of deformation compatibility in an AZ31 magnesium alloy.
129 citations
TL;DR: In this paper, the deformation mechanisms of binary Ti-Al model alloys were investigated with respect to the twinning activity using in-situ loading in combination with neutron diffraction as well as detailed post mortem electron backscatter diffraction analysis.
117 citations
TL;DR: In this article, the effect of particle size on deformation mechanisms was investigated in a polycrystalline nickel-based superalloy containing close to 50vol.% γ′.
76 citations
TL;DR: In this paper, the distribution of the misorientation within grains was quantified, and, as one would expect, it tended to be highest near the grain boundaries, and the local strain induced in a pure copper specimen during tensile loading measured using electron backscatter diffraction was compared to in-situ strain measurements using optical microscopy imaging in conjunction with image correlation technique.
Abstract: Work has been carried out recently, which demonstrates misorientation measurements recorded by using electron backscatter diffraction (EBSD) enables one to undertake local post mortem plastic strain quantification once the degree of misorientation is calibrated against plastic strain. The present paper builds on this work and investigates the possibility of determining strain in individual grains. Due to the anisotropy of crystalline grains, polycrystalline material deform inhomogeneously on a microstructural level. In this study, the local strain induced in a pure copper specimen during tensile loading measured using EBSD was compared to in-situ strain measurements using optical microscopy imaging in conjunction with image correlation technique. By applying an averaging procedure for improving the accuracy of the measured EBSD data, the distribution of the misorientation within grains was quantified, and, as one would expect, it tended to be highest near the grain boundaries.
50 citations
TL;DR: In this article, the deformation of polycrystalline nickel-base superalloys is examined using high-resolution digital image correlation to quantify local strain, electron backscattered diffraction for lattice rotations and electron channelling contrast imaging.
48 citations
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Journal Article•
28,685 citations
TL;DR: In this paper, the authors review the current state of the art as CT transforms from a qualitative diagnostic tool to a quantitative one, including the use of iterative reconstruction strategies suited to specific segmentation tasks and emerging methods that provide more insight than conventional attenuation based tomography.
Abstract: X-ray computer tomography (CT) is fast becoming an accepted tool within the materials science community for the acquisition of 3D images. Here the authors review the current state of the art as CT transforms from a qualitative diagnostic tool to a quantitative one. Our review considers first the image acquisition process, including the use of iterative reconstruction strategies suited to specific segmentation tasks and emerging methods that provide more insight (e.g. fast and high resolution imaging, crystallite (grain) imaging) than conventional attenuation based tomography. Methods and shortcomings of CT are examined for the quantification of 3D volumetric data to extract key topological parameters such as phase fractions, phase contiguity, and damage levels as well as density variations. As a non-destructive technique, CT is an ideal means of following structural development over time via time lapse sequences of 3D images (sometimes called 3D movies or 4D imaging). This includes information nee...
1,009 citations
TL;DR: In this article, a review article summarizes the recent progresses on the complex interaction between second-phase particles and recrystallization and the science behind them, and concludes that the double-edge effect of second phase particles on the behavior and mechanical properties of metallic materials is still far from being clear.
361 citations
Journal Article•
15 Jun 1999-Philosophical transactions - Royal Society. Mathematical, physical and engineering sciences
TL;DR: In this article, the main criterion for the formation of a sub-micron grain structure is the generation of a sufficiently large fraction (> 0.7) of high-angle grain boundary during the deformation process.
Abstract: Methods of deforming metals to large strains are reviewed and the process of equal channel angular extrusion is analysed in detail. The development of microstructure during large strain deformation is discussed, and it is concluded that the main criterion for the formation of a sub–micron grain structure is the generation of a sufficiently large fraction (> 0.7) of high–angle grain boundary during the deformation process. For aluminium alloys, it is found that a low–temperature anneal is required to convert the deformed microstructure into an equi–axed grain structure. The material, microstructural and processing factors that influence the formation of such fine–grain microstructures are discussed, and the stability of these microstructures at elevated temperatures is considered.
311 citations
01 Jan 2002
237 citations