Journal ArticleDOI
Heterogeneous microstructures and microtextures in cube-oriented al crystals after channel die compression
TLDR
In this article, the macroscopic and microscopic subdivisions are discussed in terms of the local deformation modes and slip amplitudes and their relation to the behavior of rolled A1 crystals.Abstract:
Pure aluminum crystals of cube orientation have been deformed in plane-strain compression to strains of unity using a channel die. The macrostructures and microstructures were characterized in three dimensions by a range of metallographic techniques including optical, scanning, and transmission electron microscopy. Particular attention was paid to quantifying global textures and local variations in crystal orientation by means of X-ray pole figures, automatic electron back-scattered diffraction (EBSD) and semiautomatic transmission electron microscope (TEM) Kikuchi line analysis. Cube crystals are observed to break up into macroscopic deformation bands aligned along the elongation direction and strongly disorientated by rotations mostly, but not uniquely, about the transverse direction. The bands develop deformation substructures of dislocation boundaries or, in certain cases, of intersecting dislocation boundaries which have characteristic microtexture signatures of alternating lattice rotations. The transition regions between the bands are composed of equiaxed dislocation cells which accommodate continuous orientation gradients over distances of about 20 µm. Compared to the behavior of rolled A1 crystals, the macroscopic bands are observed to lie in different planes, but the microscopic subdivisions and microtextures developed in the channel die and in rolling are very similar. The origins of the macroscopic and microscopic subdivisions are discussed in terms of the local deformation modes and slip amplitudes and their relation to the behavior of rolled crystals.read more
Citations
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Journal ArticleDOI
New discoveries in deformed metals
TL;DR: In this article, the authors have shown that the microstructural evolution follows a universal pattern of grain subdivision from the macroscale to the nanometer scale, and that the similarity between the behavior of materials undergoing different deformation patterns forms the basis for future research and development encompassing traditional as well as new materials and processes.
Journal ArticleDOI
Theory of orientation gradients in plastically strained crystals
TL;DR: In this article, a theory of in-grain orientation gradients in plastically strained metals is proposed, which is based on the Taylor-Bishop-Hill theory and the intrinsic and extrinsic factors.
Journal ArticleDOI
Assessment of plastic heterogeneity in grain interaction models using crystal plasticity finite element method
TL;DR: Van Houtte et al. as discussed by the authors investigated the influence of grain interaction on intra-grain deformations in the ALAMEL model and showed that the model imbibes the nature of plastic deformation at the grain boundaries very well.
Journal ArticleDOI
Eutectic solidification in hypoeutectic Al–Si alloys: electron backscatter diffraction analysis
Kazuhiro Nogita,Arne K. Dahle +1 more
TL;DR: In this article, the electron backscatter diffraction (EBSD) mapping technique using a scanning electron microscope (SEM) was used to obtain a sufficiently smooth surface from a cast Al-Si eutectic microstructure for EBSD mapping, an appropriate preparation technique by ion milling was developed and applied instead of conventional electropolishing.
Journal ArticleDOI
Flow stress anisotropy and Bauschinger effect in ultrafine grained copper
TL;DR: In this article, the effect of strain path and magnitude on the flow stress anisotropy and Bauschinger effect in ultrafine grained (UFG) copper was investigated.
References
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Journal ArticleDOI
Dislocation Models of Crystal Grain Boundaries
W. T. Read,William Shockley +1 more
TL;DR: In this article, the authors investigated the energies and motions of grain boundaries between two crystallites using the dislocation model of grain boundary and provided a quantitative expression for energy per unit area for small angles.
Journal ArticleDOI
The Mechanisms of Recrystallization in Cubic Metals with Particular Reference to Their Orientation-Dependence
I. L. Dillamore,H. Katoh +1 more
TL;DR: In this article, an analysis of the evolution of microstructure during deformation is made and the relationship between the micro-structure and annealing texture development is considered in detail.
Journal ArticleDOI
The structure of deformed aluminium and its recrystallization—investigations with transmission Kossel diffraction
S.P. Bellier,R.D. Doherty +1 more
TL;DR: In this article, a modification to the transmission Kossel diffraction technique was developed that enabled useful orientation information to be obtained from deformed aluminium, and the misorientation produced by moderate deformation by compression of coarse-grained aluminium was studied.
Journal ArticleDOI
Grain orientation dependence of microstructure in aluminium deformed in tension
Xiaoxu Huang,Niels Hansen +1 more
TL;DR: In this paper, the evolution of deformation microstructure in medium to high stacking fault energy fcc metals has been described in terms of a general framework of grain subdivision involving the formation of rotates volume elements for all deformation modes.
Journal ArticleDOI
A simple and rapid method for determining orientations and misorientations of crystalline specimens in TEM
TL;DR: In this paper, a method for determining orientation and misorientations of a crystalline specimen has been developed using a double-tilt holder for a transmission electron microscope (TEM), after tilting the specimen to allow one of the low-index zone axes for one crystallite to be close to the beam direction, the orientation of any crystallite can be obtained by determining the relative position of the Kikuchi pattern on the screen.
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