Journal ArticleDOI
Sliding behaviour and dislocation structures in aluminium grain boundaries
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In this article, the authors investigated the sliding behavior of grain boundaries and found that an off-coincidence boundary changed into an almost exact coincidence boundary by the absorption of lattice dislocations.Abstract:
Dislocation structures of grain boundaries whose sliding behaviour had already been studied, have been observed by transmission electron microscopy of the slid grain boundaries. The ordered (coincidence) and random boundaries exhibited quite different sliding behaviour and dislocation structures. In the case of ordered boundaries, sliding was difficult and remarkable slide-hardening was shown. Transmission electron microscopy evidenced the presence of a number of EGBDs in these grain boundaries. In contrast, sliding of random boundaries easily took place showing slight slide-hardening. EGBDs were hardly observed in random boundaries. A systematic change in grain boundary misorientation during sliding was observed. An off-coincidence boundary changed into an almost exact coincidence boundary by the absorption of lattice dislocations. These results can be qualitatively explained by a dislocation model of sliding in which the absorption of lattice dislocations into the grain boundary is considered t...read more
Citations
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Overview of constitutive laws, kinematics, homogenization and multiscale methods in crystal plasticity finite-element modeling: Theory, experiments, applications
TL;DR: In this paper, a review of continuum-based variational formulations for describing the elastic-plastic deformation of anisotropic heterogeneous crystalline matter is presented and compared with experiments.
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Optimization of grain boundary character distribution for intergranular corrosion resistant 304 stainless steel by twin-induced grain boundary engineering
TL;DR: In this paper, the effects of process parameters, pre-strain, annealing temperature, etc. on grain boundary character distribution and intergranular corrosion in thermomechanical treatment were examined during grain boundary engineering of type 304 austenitic stainless steel.
Journal ArticleDOI
The control of brittleness and development of desirable mechanical properties in polycrystalline systems by grain boundary engineering
TL;DR: Grain boundaries can be effectively controlled to produce or enhance their beneficial effects and also to diminish or reduce their detrimental effects on bulk properties in polycrystalline materials as mentioned in this paper, which remains a serious problem of material processing and development.
Journal ArticleDOI
The role of heterogeneous deformation on damage nucleation at grain boundaries in single phase metals
Thomas R. Bieler,Thomas R. Bieler,Philip Eisenlohr,Franz Roters,Deepak Kumar,D. E. Mason,Martin A. Crimp,Dierk Raabe +7 more
TL;DR: In this paper, a crystal plasticity-finite element (CP-FEM) based model of an extensively characterized microstructural region has been used to determine if the stress-strain history provides any additional insights about the relationship between shear and damage nucleation.
Book
The measurement of grain boundary geometry
TL;DR: A survey of grain boundary geometry investigations can be found in this paper, where the authors discuss the importance of grain boundaries in polycrystals grain boundary structure and "special" boundaries.
References
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Journal ArticleDOI
The structure of high-angle grain boundaries
TL;DR: In this paper, a superimposed dislocation network is proposed for the cubic system, which is a natural extension of previous dislocation models and models based on coincidence relationships, and explains many of the observed properties of grain boundaries.
Journal ArticleDOI
Boundary defects, and atomistic aspects of boundary sliding and diffusional creep
TL;DR: The behavior of atoms in a grain or phase boundary when the boundary slides (when the crystals which meet at the boundary suffer a relative shear displacement parallel to the boundary plane) and during diffusional creep is described in this article.
Journal ArticleDOI
The annealing of dislocations in high-angle grain boundaries
P. H. Pumphrey,H. Gleiter +1 more
TL;DR: In this paper, hot-stage electron microscopy is used to study the annealing behavior of lattice dislocations in high-angle grain boundaries in Ni, Ni 5% Al, austenitic stainless steel and Al 0·9 % Mg.
Journal ArticleDOI
On the absorption of dislocations by grain boundaries
R. C. Pond,David Smith +1 more
TL;DR: In this article, the absorption process is extended to random boundaries with the help of a new model for their structure in which the existence of an irregular arrangement of certain low energy groups of atoms is postulated.
Journal ArticleDOI
On the role of grain boundary dislocations in high temperature creep
TL;DR: In this paper, the processes that occur at grain boundaries during high temperature creep at low strain rates have been studied by scanning electron microscopy of a fiducial grid and by transmission electron microscope of pure aluminium.