Phase transitions at grain boundaries in the presence of impurities

Maksimova, E.L.; Rabkin, Eugen; Shvindlerman, L.S.; Straumal, Boris B.

doi:10.1016/0001-6160(89)90083-7

Cited by 19 publications

(11 citation statements)

References 11 publications

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“…During recrystallization, the driving force for recrystallization front migration depends mainly on the stored energy level, which increases with the cold deformation amount. Besides, the grain boundary mobility generally increases with temperature [25]. Thus, the recrystallization front migration velocity increases with both the deformation amount and the annealing temperature through their effects on driving force and mobility, respectively.…”

Section: Discussionmentioning

confidence: 99%

Thermo-mechanical factors influencing annealing twin development in nickel during recrystallization

Jin

Rollett

et al. 2015

J Mater Sci

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International audienceThe effects of prior stored energy level, annealing temperature, heating velocity, and initial grain size on annealing twin development during static recrystallization of commercially pure nickel (99.999 %) are investigated. The twin content (measured as the twin boundary density or as the number of twins per grain) at the end of recrystallization is shown to be primarily influenced by the prior stored energy level and by the initial grain size, but the effects of heating rate and the annealing temperature are negligible. Taken together, the results are consistent with a new proposition that roughness of the recrystallization front promotes the formation of annealing twins during recrystallization

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Section: Discussionmentioning

confidence: 99%

Thermo-mechanical factors influencing annealing twin development in nickel during recrystallization

Jin

Rollett

et al. 2015

J Mater Sci

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“…Several investigations on thermodynamic and kinetic properties of GBs indicate a``special to general'' GB phase transition at a certain temperature T c and only below T c the GBs exhibit special properties [6,26,27]. The temperature T c itself depends on the magnitude of the deviation in orientation from the special high coincidence GB.…”

Section: Temperature Dependence Of Au Gb Diusion In Cu Bicrystalsmentioning

confidence: 99%

Tracer diffusion of Au and Cu in a series of near Σ=5 (310)[001] symmetrical Cu tilt grain boundaries

et al. 1999

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AbstractÐGrain boundary diusion of Au and Cu was measured in a series of Cu bicrystals with symmetrical near AE 5, Â 36X98 310001 CSL tilt grain boundaries (GBs) using the radiotracer and the serial sectioning technique. The orientations of the bicrystals were very precisely determined with the Kossel technique where all three macroscopic parameters describing the orientations of the grains in the bicrystal were evaluated. The tilt angles ranged from 33.218 to 39.268. The GB diusion of the radiotracers 195 Au and 64 Cu was measured as a function of tilt angle and temperature. In the investigated temperature range 1030±661 K the orientation dependence of both radiotracers shows a characteristic cusp not exactly at but slightly below the ideal AE 5 CSL GB. The Arrhenius parameters, activation enthalpy and frequency factor, determined from lower temperature data adopt a maximum, again slightly before the ideal AE 5 CSL GB. These features are discussed with respect to the accidental small twist and second tilt orientations and the corresponding dislocation network inherent in the investigated real GBs. With increasing temperature a negative deviation from a straight Arrhenius behaviour is observed. This result indicates a certain change in the GB structure in the temperature range above 800 K. #

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“…The presence of GBFs (or more general-GB complexions) strongly influences the grain growth as well as GB character distribution in oxides and metallic alloys [54,[56][57][58][59]63,75,76,79,80,83,106,[123][124][125][126][127][128][129][130][151][152][153][154][155][156][157][158][159][160]. It has been known for a long time that impurities can shift the borders between GBs with special and general structure and properties [142,143,220,221]. The GB complexions enriched by the impurities form, most likely, in the GBs with high energy (also called general GBs) [79] and, less likely, in coincidence GBs with dense and nearly perfect structure [123].…”

Section: Discussionmentioning

confidence: 99%

Grain Boundary Complexions and Phase Transformations in Al- and Cu-Based Alloys

Kogtenkova

Straumal

Korneva

et al. 2018

Metals

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High-pressure torsion has been used to obtain the ultra-fine grained (UFG) state with a high specific area of grain boundaries (GBs) in Al-Zn, Al-Mg, Cu-Ag, Cu-Co, and Cu-Ni solid solutions with face-centered cubic (fcc) lattices. The UFG samples were heated in a differential scanning calorimeter (DSC). Small endothermic peaks in the DSC curves were observed in the one-phase solid-solution area of the respective phase diagrams, i.e., far away from the bulk solidus and solvus lines. A possible explanation of these endothermic peaks is based on the hypothesis of phase transformations between GB complexions. This hypothesis has been supported by observations with transmission electron microscopy and electron backscattering diffraction. The new lines of GB phase transformations have been constructed in the Al-Zn, Al-Mg, Cu-Ag, Cu-Co, and Cu-Ni bulk phase diagrams.

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Phase transitions at grain boundaries in the presence of impurities

Cited by 19 publications

References 11 publications

Thermo-mechanical factors influencing annealing twin development in nickel during recrystallization

Thermo-mechanical factors influencing annealing twin development in nickel during recrystallization

Tracer diffusion of Au and Cu in a series of near Σ=5 (310)[001] symmetrical Cu tilt grain boundaries

Grain Boundary Complexions and Phase Transformations in Al- and Cu-Based Alloys

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