Journal ArticleDOI
Grain boundaries as sinks for dislocations
M.W. Grabski,R. Korski +1 more
Reads0
Chats0
TLDR
In this article, the relative grain boundary energy after annealing at 600°c is a function of amount of previous strain, but is always higher than that of material annealed at 1000°c.Abstract:
A thermal grooving technique has been used to measure the relative grain boundary energy of deformed and annealed copper. The relative grain boundary energy after annealing at 600°c is a function of amount of previous strain, but is always higher than that of material annealed at 1000°c. Annealing at 900°c leads to a return of the energy towards the equilibrium value. On the basis of the above results a mechanism is proposed for the action of grain boundaries as a sink for dislocations.read more
Citations
More filters
Journal ArticleDOI
Extreme grain refinement by severe plastic deformation: A wealth of challenging science
Yuri Estrin,Alexei Vinogradov +1 more
TL;DR: A brief overview of the available SPD technologies is given in this paper, along with a summary of unusual mechanical, physical and other properties achievable by SPD processing, as well as the challenges this research is facing, some of them generic and some specific to the nanoSPD area.
Journal ArticleDOI
On the structure, stress fields and energy of nonequilibrium grain boundaries
TL;DR: In this paper, the changes of grain boundary (GB) structure caused by the absorption of lattice dislocations are analyzed, showing that the variance of GBD spacings is a good quantitative measure of the degree of GB structure nonequilibrium, and the abating law of x − 1 2 for long range stress fields of disordered GBD networks is also calculated.
Journal ArticleDOI
Nanostructure formation on the surface of railway tracks
Witold Lojkowski,Witold Lojkowski,M. Djahanbakhsh,G. Bürkle,Stanislaw Gierlotka,W. Zieliński,Hans-Jörg Fecht +6 more
TL;DR: In this paper, it is shown that the surface layer of a railway track transforms during exploitation into a nanocrystalline Fe-C alloy and the mechanism of the nanostructure formation is discussed.
Journal ArticleDOI
Ultra-fast diffusion channels in pure Ni severely deformed by equal-channel angular pressing
TL;DR: In this paper, the radiotracer technique was applied by using the 63Ni isotope and high-precision mechanical grinding, and ultra-fast diffusion rates, which exceed those along general high-angle grain boundaries in annealed coarse-grained Ni, were observed.
Journal ArticleDOI
The microstructural characteristics of ultrafine-grained nickel
TL;DR: In this article, a detailed investigation was conducted to evaluate the microstructural characteristics in samples of pure nickel processed using three different procedures of severe plastic deformation (SPD): equal-channel angular pressing (ECAP), high-pressure torsion (HPT), and a combination of ECAP and HPT.
References
More filters
Journal ArticleDOI
The Recrystallization Process in Some Polycrystalline Metals
TL;DR: In this paper, a theory based on the known form of the recrystallization kinetics without necessarily introducing any anisotropy of grain boundary mobility is proposed, which is identical to the activation energy for grain boundary migration.
Journal ArticleDOI
Superplasticity in the Aluminium–Zinc Eutectoid
A. Ball,M. M. Hutchison +1 more
TL;DR: In this article, a grain-boundary sliding and grain rotation mechanism was proposed for superplastic extension of the aluminium-zinc eutectoid, where the strain rate (έ), flow stress (σ), grain size (L), and temperature were related empirically.
Journal ArticleDOI
Dislocation Arrangement in Copper Single Crystals as a Function of Strain
TL;DR: In this article, a large scale (1 mm) feature analysis of the dislocation array of deformed copper single crystals was performed by using a bright field technique making use of dislocation disappearance criteria, and the results showed that secondary slip occurs in the regions of high internal stress at the heads of pile-ups.
Journal ArticleDOI
Absolute interfacial energies of [001] tilt and twist grain boundaries in copper☆
N.A Gjostein,F.N Rhines +1 more
TL;DR: In this paper, the absolute interfacial energies of tilt and twist boundaries in copper have been determined, by using a Zeiss Interference Microscope to measure the dihedral angles which form during the thermal grooving process.
Journal ArticleDOI
The dislocation density, flow stress and stored energy in deformed polycrystalline copper
TL;DR: The relationship between dislocation density, flow stress and stored energy in polycrystalline copper has been determined experimentally as discussed by the authors, and the stored energy can be predicted from the observed density and distribution of dislocations.