Correlation of plastic deformation and dynamic recrystallization in magnesium alloy ZK60

Galiyev, Arthur; Kaibyshev, Rustam; Gottstein, Günter

doi:10.1016/s1359-6454(01)00020-9

Cited by 1,100 publications

(474 citation statements)

References 18 publications

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“…During dynamic recrystallization (DRX), new grains are initiated according to complicated and still unclear atomistic mechanisms and usually correlated with stress/strain fields at continuum level (Galiyev et al, 2001;Chauve et al, 2015). Together with considering the experimentally revealed grain boundary (GB) bulging mechanism (Ponge and Gottstein, 1998;Wusatowska-Sarnek et al, 2002;Miura et al, 2007) , we make the following core assumptions: (a) DRX grains nucleate when some material at a GB undergoes certain atomistic transformations driven by thermal fluctuation and local stress to form a stable nucleus; (b) the time scale of this transformation and the formation of a stable nucleus is at atomic level and hence instantaneous as compared to the applied deformation, and (c) the length scale of this transformation is small relative to the FFT-CP computational grid.…”

Section: Statistical Model Of Dynamic Recrystallization Nucleationmentioning

confidence: 99%

An integrated full-field model of concurrent plastic deformation and microstructure evolution: Application to 3D simulation of dynamic recrystallization in polycrystalline copper

Zhao

Low

Wang

et al. 2016

International Journal of Plasticity

105

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Many time-dependent deformation processes at elevated temperatures produce significant concurrent microstructure changes that can alter the mechanical properties in a profound manner. Such microstructure evolution is usually absent in mesoscale deformation models and simulations. Here we present an integrated full-field modeling scheme that couples the mechanical response with the underlying microstructure evolution. As a first demonstration, we integrate a fast Fourier transform-based elasto-viscoplastic (FFT-EVP) model with a phase-field (PF) recrystallization model, and carry out three-dimensional simulations of dynamic recrystallization (DRX) in polycrystalline copper. A physics-based coupling between FFT-EVP and PF is achieved by (1) adopting a dislocation-based constitutive model in FFT-EVP, which allows the predicted dislocation density distribution to be converted to a stored energy distribution and passed to PF, and (2) implementing a stochastic nucleation model for DRX. Calibrated with the experimental DRX stress-strain curves, the integrated model is able to deliver full-field mechanical and microstructural information, from which quantitative description and analysis of DRX can be achieved. It is suggested that the initiation of DRX occurs significantly earlier than previous predictions, due to heterogeneous deformation. DRX grains are revealed to form at both grain boundaries and junctions (e.g., quadruple junctions) and tend to grow in a wedge-like fashion to maintain a triple line (not necessarily in equilibrium) with old grains. The resulting stress redistribution due to strain compatibility is found to have a profound influence on the subsequent dislocation evolution and softening.

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Section: Statistical Model Of Dynamic Recrystallization Nucleationmentioning

confidence: 99%

An integrated full-field model of concurrent plastic deformation and microstructure evolution: Application to 3D simulation of dynamic recrystallization in polycrystalline copper

Zhao

Low

Wang

et al. 2016

International Journal of Plasticity

105

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“…[17,22] DRX is complex and can occur by a number of different mechanisms. [36] However, many of mechanisms such as strain-induced boundary migration (SIBM) require the movement of grain boundaries. This movement must occur more rapidly than that assumed for static recrystallization since the time available for DRX is usually on the order of seconds (or less).…”

Section: Solute Dragmentioning

confidence: 99%

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

Robson

2013

Metall Mater Trans A

186

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Magnesium alloys that contain certain rare-earth (RE) additions are known to have improved formability and this can be partly attributed to the different texture they display after recrystallization. Previous experimental work has identified segregation of RE to grain boundaries and dislocations as being potentially important in producing this change in behavior. In the present paper, two classical models (Langmuir-McClean and Cahn-Lu¨cke-Stu¨we) are used to explore the likely effect of RE additions on grain boundary solute concentration and drag. It is demonstrated that a wide range of RE elements are predicted to segregate strongly to grain boundaries due to the large atomic size misfit with magnesium. The maximum level of segregation is produced for elements such as Y or Gd that combine a high misfit and high bulk solubility. Segregated Y is predicted to produce a solute drag pressure on migrating boundaries several orders of magnitude greater than that obtained by Al or Zn additions. It is demonstrated that while this drag is predicted to be insufficient to strongly retard static recrystallization under typical annealing conditions, it is expected to suppress dynamic recrystallization by any mechanism requiring boundary migration.

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“…The beneficial effect of twinning on DRX in Mg alloys as has been observed previously under quasi-static conditions [e.g. [45][46][47][48][49] and it has been attributed to the large stresses accumulated close to twin boundaries, which promote the operation of multiple slip modes. Fig.…”

Section: Discussionmentioning

confidence: 56%

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

Dudamell

Ulacia

Gálvez

et al. 2011

Materials Science and Engineering: A

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An AZ31 rolled sheet alloy has been tested at dynamic strain rates (e~10 3 s _1 ) at 250°C up to various intermediate strains before failure in order to investigate the predominant deformation and restoration mechanisms. In particular, tests have been carried out in compression along the rolling direction (RD), in tension along the RD and in compression along the normal direction (ND). It has been found that dynamic recrystallization (DRX) takes place despite the limited diffusion taking place under the high strain rates investigated. The DRX mechanisms and kinetics depend on the operative deformation mechanisms and thus vary for different loading modes (tension, compression) as well as for different relative orientations between the loading axis and the c-axes of the grains. In particular, DRX is enhanced by the operation of (c + a) slip, since cross-slip and climb take place more readily than for other slip systems, and thus the formation of high angle boundaries is easier. DRX is also clearly promoted by twinning.

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Correlation of plastic deformation and dynamic recrystallization in magnesium alloy ZK60

Cited by 1,100 publications

References 18 publications

An integrated full-field model of concurrent plastic deformation and microstructure evolution: Application to 3D simulation of dynamic recrystallization in polycrystalline copper

An integrated full-field model of concurrent plastic deformation and microstructure evolution: Application to 3D simulation of dynamic recrystallization in polycrystalline copper

Effect of Rare-Earth Additions on the Texture of Wrought Magnesium Alloys: The Role of Grain Boundary Segregation

Influence of texture on the recrystallization mechanisms in an AZ31 Mg sheet alloy at dynamic rates

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