Deformation of cube-oriented grains and formation of recrystallized cube grains in a hot deformed commercial AlMgMn aluminium alloy

Vatne, Hans Erik; Shahani, Ravi; Nes, E.

doi:10.1016/1359-6454(96)00077-8

Cited by 111 publications

(58 citation statements)

References 29 publications

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“…This makes cube bands very potent nucleation sites. The strength of cube texture upon recrystallization is found to be enhanced by a high initial cube fraction (large amount of cube bands), a low Zener-Hollomon parameter (higher stability of the cube grains during deformation) and a high strain (large surface area of cube bands) [25].…”

Section: Texture Evolution During Deformationmentioning

confidence: 99%

“…A low value of the JMAK exponent can be the result of an inhomogeneous distribution of stored energy at low annealing temperatures. JMAK exponents are found to approach ideal values at high annealing temperatures when the inhomogeneous distribution in stored energy is minimal [25]. The effect of different nucleation and growth conditions on different n values is given in Table 2.2.…”

Section: Johnson Mehl Avrami Kolmogorov (Jmak) Modelmentioning

confidence: 99%

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Reduction of Annealing Times for Energy Conservation in Aluminum

Rollett¹,

Weiland²,

Alvi³

et al. 2005

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and the Pennsylvania Technology Investment Authority (PTIA) to make processing of aluminum less costly and more energy efficient. Researchers in the Department of Materials Science and Engineering have investigated how annealing processes in the early stages of aluminum processing affect the structure and properties of the material. Annealing at high temperatures consumes significant amounts of time and energy. By making detailed measurements of the crystallography and morphology of internal structural changes they have generated new information that will provide a scientific basis for shortening processing times and consuming less energy during annealing. Background:The status of the Domestic Technology for the thermomechanical processing of aluminum alloy intended for sheet and plate product is as follows. Hot rolling processes are aimed at breaking down as-cast structures in Direct-Chill (DC) ingots. Critical to the success of this stage of the processing is the refinement of the as-cast microstructure in terms of both grain morphology and the crystallographic orientations present; we will refer to the latter as texture. 2 particularly important to the application of such materials as 5xxx for can closures and 3xxx for beverage can stock. In particular, it is standard practice to anneal partially broken-down slabs for long times in order to ensure that recrystallization is completed before continuing the hot rolling process. Simple models exist that describe the rate at which the recrystallization process takes place but no information is available on the texture development. This proposal project will remedy that lack by measuring texture-dependent recrystallization rates (kinetics). Status:The project is complete. Three different commercial purity aluminum alloys (AA1050, AA5005 and AA3003) were studied. The main applications of these (non-heat treatable) alloys are beverage cans, automotive products etc. Recrystallization and texture evolution are two very important transformations in the thermo-mechanical processing of these alloys. These transformations are of critical importance for aluminum industry as they are directly related to energy consumption and properties of the finished products. The main aim of this project is to further increase our current understanding of recrystallization and texture evolution using advanced analytical tools like Electron Backscatter Diffraction (EBSD). The project was divided into two main parts -experimental data collection and extraction of critical parameters from experimental data forming one part and simulation of recrystallization from the experimental data and comparison of experimental results with simulation being the other part. The experimental data collection and analysis involved annealing of asreceived samples and scanning them in an EBSD system. The main approach followed in the experimental analysis was that of identification of the most important parameters required for quantification of recrystallization and texture evolution. This analysis required de...

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Section: Texture Evolution During Deformationmentioning

confidence: 99%

Section: Johnson Mehl Avrami Kolmogorov (Jmak) Modelmentioning

confidence: 99%

Reduction of Annealing Times for Energy Conservation in Aluminum

Rollett¹,

Weiland²,

Alvi³

et al. 2005

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show abstract

“…Based on available data in the published studies. [68,79,86,89,90] the increase in Q of Al alloys, where Mg is the predominant solute, due to the presence of secondphase particles as a function of f=l is demonstrated in Figure 9 Inspection of the published literature reveals that, during high-temperature deformation, the d value of a single-phase Al alloy is primarily determined by deformation conditions (i.e., Zener-Hollomon parameter) and insensitive to the particular alloy compositions [68,91] ; however, the d value can be effectively reduced in an Al alloy containing the dispersion of fine second-phase particles. [68] Based on the discussion, it can be presumably suggested that the presence of second-phase particles changes the values of A and B in Eq.…”

Section: B Mechanisms Underlying Stress-induced Grain Growth During mentioning

confidence: 99%

Erratum to: Stress-Induced Grain Growth in an Ultra-Fine Grained Al Alloy

Lin

Wen

Liu

et al. 2014

Metall Mater Trans B

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This paper reports on a study of the stress-induced grain growth phenomenon in the presence of second-phase particles and solutes segregated at grain boundaries (GBs) during high-temperature deformation of an ultra-fine grained (UFG) Al alloy synthesized via the consolidation of mechanically milled powders. Our results show that grain growth was essentially inhibited during annealing at 673 K (400°C) in the absence of an externally applied stress, whereas in contrast, grain growth was enhanced by a factor of approximately 2.7 during extrusion at 673 K (400°C). These results suggest that significant grain growth during hot extrusion was attributable to the externally applied stresses stemming from the state of stress imposed during extrusion and that the externally applied stresses can overcome the resistance forces generated by second-phase particles and solutes segregated at GBs. The mechanisms underlying stressinduced grain growth were identified as GB migration and grain rotation, which were accompanied by dynamic recovery and possible geometric dynamic recrystallization, while discontinuous dynamic recrystallization did not appear to be operative. His research interests include the synthesis and behavior of nanostructured and multi-scale materials with particular emphasis on processing fundamentals and physical behavior; thermal spray processing of nanostructured materials; spray atomization and deposition of structural materials; high temperature-high pressure atomization processes; mathematical modeling of advanced materials and processes; and additive manufacturing. He has published 515 journal and 225 conference publications on topics ranging from nanomaterials to extremely strong aluminum alloys. Prof. Lavernia has delivered more than 150 invited lectures and seminars in over 17 countries. He

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“…There is experimental evidence of enhanced recovery in cube orientation. Larger and more developed substructures were observed by transmission electron microscopy (TEM) within deformed cube bands in warm extruded aluminum [6]. In our previous study, the substructure within grains of different orientations was investigated by means of electron back scatter diffraction (EBSD) imaging in a cold rolled and subsequently annealed alloy.…”

Section: Introductionmentioning

confidence: 99%

In-situ annealing and computation study of cube texture development in a commercial aluminum alloy

Sukhopar

Gottstein

2016

International Journal of Materials Research

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In-situ annealing and computation study of cube texture development in a commercial aluminum alloyThe aim of this study was to identify the physical processes of nucleation and growth of cube grains by means of in-situ annealing experiments. The calculated nucleation site density at cube bands was found not to be sufficient for a correct computational prediction of the cube recrystallization texture. Growth competition at an early stage of recrystallization has to be taken into account for a better agreement between model and experiment, which necessitates a sufficiently refined grid resolution in discrete computer models of recrystallization. Accounting for these dependencies yields an excellent prediction of both the cube component in the recrystallization texture and the grain size distribution. The contribution of cube nucleation apart from cube bands to the cube recrystallization texture was found to be negligible.

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Deformation of cube-oriented grains and formation of recrystallized cube grains in a hot deformed commercial AlMgMn aluminium alloy

Cited by 111 publications

References 29 publications

Reduction of Annealing Times for Energy Conservation in Aluminum

Reduction of Annealing Times for Energy Conservation in Aluminum

Erratum to: Stress-Induced Grain Growth in an Ultra-Fine Grained Al Alloy

In-situ annealing and computation study of cube texture development in a commercial aluminum alloy

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