Recrystallization and related annealing phenomena hatherly m humphreys f j. (PDF) Orientation Preference of Recrystallization in Supersaturated Aluminum Alloys Influenced by Concurrent Precipitation 2019-01-30

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Recrystallization and Related Annealing Phenomena by F.J. Humphreys and M. Hatherly by F.J. Humphreys and M. Hatherly

recrystallization and related annealing phenomena hatherly m humphreys f j

Beide Prozesse basieren auf Diffusionsvorgängen. The flow stresses exhibit typical hot deformation behavior. The through thickness strain distribution showed higher strains in the edge vicinities than in the sheet core. However, a certain subgrain keeps expanding to a stage where some part or parts of the boundary reach es and consume s a high stored energy deformation zone s to form a local dislocation free zone s having an orientation similar to the subgrain. At the same time, the other parameters of structure processed, e. The dynamic recrystallization only occurred at low Z values, which must be below or equal to a constant of 5. The supersaturated Mn will precipitate as Mn-bearing dispersoids during thermo-mechanical processing Li and Arnberg, 2003a , changing the microchemistry of the alloy.

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Simulating recrystallization in titanium using the phase field method

recrystallization and related annealing phenomena hatherly m humphreys f j

There is a brief discussion of the substructures developed during deformation to higher strains. Synchrotron experiments have been conducted in transmission at 100 keV with a 2D detector. In recent years, the use of magnesium alloys has increased due to its low density. It was also found that the misorientation axis tended towards alignment with the transverse direction as strain increases. Within six hours the three dimensional orientation distribution functions of four specimens are obtained.

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(PDF) Microstructure, texture and mechanical properties of continuous cast AA5083 and 5182 aluminum alloys

recrystallization and related annealing phenomena hatherly m humphreys f j

The book covers recovery, recrystallization and grain growth in depth including specific chapters on ordered materials, two-phase alloys, annealing textures and annealing during and after hot working. The through thickness strain distribution showed higher strains in the edge vicinities than in the sheet core. The subjects treated in the book are all active research areas, forming a major part of at least four regular international conference series. Currently, there is hardly any work which has attempted to present a concise and systematic review of the recrystallization in emerging materials with a view to reconcile its manifestations with trends established from recrystallization studies in traditional alloys. Mechanical twinning occurred as an additional feature in these crystals after deformation at low temperature. In the last few years, Al-TiB2 have been utilized in high-tech structural and functional applications including aerospace, defense, automotive, and thermal management areas, as well as in sports and recreation. The results suggest that the substructure morphology is dependent upon the total strain, but this has not been quantified.

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Simulating recrystallization in titanium using the phase field method

recrystallization and related annealing phenomena hatherly m humphreys f j

A model for the deformation zone around particles is proposed based on observations of Humphreys. In this paper, a new method inspired by the 3D X-ray diffraction tomography is proposed to follow recrystallization kinetics at the same time. It will only consider Al- and Mg-based matrices, even though Ti-based systems have considerable potential, particularly for high temperature applications. The overall growth of recrystallization nuclei was found to be controlled by the variation in both the stored energy and orientation of the surrounding deformation substructure that results in heterogeneous growth by so-called orientation pinning. The heating rate is shown to substantially affect the recrystallisation behaviour. Humphreys, 1977 and therefore affects the microstructure evolution during processing, which determines the mechanical behaviour and final properties of the materials. Texture inhomogeneities were evidenced by the presence of Goss component {011} on the surface originating due to surface shear and diffuse texture at the interior.

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Application of FIB

recrystallization and related annealing phenomena hatherly m humphreys f j

Well established dislocation theory is then used to evaluate the resulting change in hardness or yield strength at room temperature, based on a consideration of the intrinsic resistance to dislocation motion due to solute atoms and particles, respectively following heat treatment. Recovery and recrystallization are competing restoration mechanisms driven by the stored energy of the crystal and each of them consists of a series of events. Correspondingly, the subgrain size increased and the dislocation density decreased. Electrical conductivity, used as an indication of solid solute content and amount of precipitation, was measured by using a Foerster Sigmatest 2. Rather they were found to partition to sites of the S phase Al2CuMg which forms as a minor precipitate under these ageing conditions. Despite extensive experimental observations on the formation of P-oriented grains, the theoretical grounds for the formation of P-oriented grains is not yet fully established. Several of the unusual properties exhibited by nanocrystalline materials are shown to be simply a manifestation of an enhanced intercrystalline volume fraction consisting of distinct grain boundary and triple line disclination structures.

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Application of FIB

recrystallization and related annealing phenomena hatherly m humphreys f j

Misorientation analysis suggests that both easy and hard slip systems are responsible for grain distortions. In addition, mobilities of left bracket 001 right bracket , left bracket 110 right bracket , and left bracket 111 right bracket tilt boundaries in bicrystalline thin films of gold have been measured directly by transmission electron microscopy. At lower Z, the dislocations collected into more widely spaced and less dense tangles. By comparison of calculated and measured values, it is concluded that mobility of low-angle tilt boundaries is controlled by transfer of vacancies between individual dislocations by a bulk diffusion mechanism, whereas mobility of both random and special high-angle tilt boundaries is controlled by random or coordinated atomic movement by short-circuit diffusion mechanisms. It was also revealed that the changes in the hardness profile in the thermomechanically affected zone of the retreating side are predominantly influenced by changes in grain size in that domain. Related Annealing Phenomena fulfils the information needs of materials scientists in both industry and academia.

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Recrystallization and related annealing phenomena / F.J. Humphreys and M. Hatherly

recrystallization and related annealing phenomena hatherly m humphreys f j

The mechanism of the evolution of the Goss texture by secondary recrystallization can be explained, by considering the special distribution of coincidence boundaries and their specific grain boundary migration characteristics associated with the intensity of the inhibitor. . Analysis of diagrams shows that the deformation resistance increases with decreasing of temperature, while a weak peak is observed at temperature 1000—1200°C, when dynamic recrystallization starts. The pinning pressure was calculated using the whole size distribution. A simple theory which analyses discontinuous and continuous recovery, recrystallization and grain growth, and which enables the relationships between the various annealing phenomena to be explored, has been extended to include the effects of a dispersion of second-phase particles. Twinning involving {301} and {101} twin configurations was identified as the additional mechanism of effective deformation. The annealing textures are successfully simulated by considering strain heterogeneities in the particle affected zone and by employing orientation selection during both nucleation and growth stages of recrystallisation.

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Recrystallization and Related Annealing Phenomena

recrystallization and related annealing phenomena hatherly m humphreys f j

His interests include strength of materials, constitutive relations, microstructure, texture, anisotropy, grain growth, recrystallization, formability and stereology. Application to grain growth results in predictions which are consistent with those of more complex theories, and the model is also used to analyse the effect of a dispersion of second-phase particles on recrystallization occurring by either strain induced boundary migration or by particle-stimulated nucleation. Dynamic recrystallization takes place in copper single crystals during tensile deformation above 800 K. Improvements to the model including the incorporation of orientation texture dependent stored energies and crystallographic and geometric factors effecting boundary growth rates are discussed. The mean grain size in the transverse direction was 320 nm. Precipitation strengthening can overtake recovery softening when prestrained alloy was annealed below 573 K. Dynamic recrystallization is a discontinuous process.

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Thermomechanical Processing of Aluminium Alloys

recrystallization and related annealing phenomena hatherly m humphreys f j

However, the long-term performance and stability of the applied membranes are extremely important for the possible industrial exploitation of these reactors. The investigation used a hot compression machine equipped with a control system for quenching after hot deformation. A material model based on the dominant deformation mechanisms of the alloy is assumed to have a more extensive range of validity compared to an empirical relationship. Attention is focused on the phenomena of dynamic recrystallization and recovery, plus crack development in association with high-temperature, high-rate deformation. Von Neumann's and Lewis's laws can therefore be generalized to a considerable variety of froths, tissues, metallurgical aggregates, etc.

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Microstructural stability of ultrafine grained cold sprayed 6061 aluminum alloy, Applied Surface Science

recrystallization and related annealing phenomena hatherly m humphreys f j

The principles of texture evolution during the rolling deformation of fcc metals are presented, and effects which enable texture formation and local structure evolution to be correlated are analysed by comparing experimental rolling textures in fcc metals with the results of theoretical predictions based on homogeneous slip on discrete slip systems Taylor type models. During the time spent in the reactor core, few fuel cladding elements can become susceptible to local chromium depletion at grain boundaries, which is ascribed to the time evolution of the microstructural damage caused by the neutron bombardment in the reactor core. There is a detailed discussion of the mechanisms whereby dislocations are generated at the particles during deformation. Alloys based on aluminium, titanium, copper, iron, and nickel are considered, and also aluminium based metal-matrix composites, intermetallic phases, and crystalline ceramic materials. The combination of high strength and good ductility are very desirable for advanced structural and functional applications. The standard deviations are related to the grain size log-norm distribution in the map.

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