Observations of lattice curvature near the interface of a deformed aluminium bicrystal

Sun, Sihao; Adams, Brent L.; King, Wayne E.

doi:10.1080/01418610008212038

Cited by 248 publications

(121 citation statements)

References 18 publications

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“…Secondly, the special orientation of nucleated DRX grains (e.g., forming the Σ3 twin boundary with the parent grain (Wusatowska-Sarnek et al, 2002)) has not been considered in the current model. Finally, the dislocation-based constitutive laws employed and modified in the current model can be further improved towards a more physics-based manner to account for features such as GND emission/absorption at grain boundaries or interfaces (Sun et al, 2000) and GND saturation (Kysar et al, 2010;Öztop et al, 2013). The future adoption of the finite-strain FFT-CP, would allow a complete simulation of DRX and more accurate prediction of the steady state mean grain size.…”

Section: Discussionmentioning

confidence: 99%

“…Calculation of GND through Eq. (7), however, ignore the effect that the grain boundary or interface, where the deformation gradient usually build, can also act as a source/sink to emit/absorb GND (Sun et al, 2000). Recently, the saturation of GND has been studied both experimentally (Kysar et al, 2010) and theoretically (Öztop et al, 2013).…”

Section: Crystal Plasticity Constitutive Lawsmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Crystal Plasticity Constitutive Lawsmentioning

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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“…4 (and in Larson et al, 2008) Sun et al, 2000;Demir et al, 2009;Jiang et al, 2013) do not consider the elastic strains based on the insignificance of the elastic strain fields in comparison to the lattice rotation fields.…”

Section: Statistical Properties Of the Simulated Dislocation Density mentioning

confidence: 99%

A statistical analysis of the elastic distortion and dislocation density fields in deformed crystals

Mohamed¹,

Larson²,

Tischler³

et al. 2015

Journal of the Mechanics and Physics of Solids

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CitationA statistical analysis of the elastic distortion and dislocation density fields in deformed crystals This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract.The statistical properties of the elastic distortion fields of dislocations in deforming crystals are investigated using the method of discrete dislocation dynamics to simulate dislocation structures and dislocation density evolution under tensile loading. Probability distribution functions (PDF) and pair correlation functions (PCF) of the simulated internal elastic strains and lattice rotations are generated for tensile strain levels up to 0.85%. The PDFs of simulated lattice rotation are compared with sub-micrometer resolution three-dimensional X-ray microscopy measurements of rotation magnitudes and deformation length scales in 1.0% and 2.3% compression strained Cu single crystals to explore the linkage between experiment and the theoretical analysis. The statistical properties of the deformation simulations are analyzed through determinations of the Nye and Kröner dislocation density tensors. The significance of the magnitudes and the length scales of the elastic strain and the rotation parts of dislocation density tensors are demonstrated, and their relevance to understanding the fundamental aspects of deformation is discussed.

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“…Then, 33 types of potential dislocations were taken into account for the calculation of GND density (see references [31,32]). L1-norm [27,33], defined as Eq. (1), was used in the calculations and a lower bound estimate of the GND content was determined by self-developed routines.…”

Section: Cross-correlation-based Methods and Gnd Density Calculationmentioning

confidence: 99%

Study of plastic deformation mechanisms in TA15 titanium alloy by combination of geometrically necessary and statistically-stored dislocations

et al. 2016

International Journal of Materials Research

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Study of plastic deformation mechanisms in TA15 titanium alloy by combination of geometrically necessary and statistically-stored dislocationsThis study combines geometrically necessary dislocation analysis and statistically-stored dislocation identification to investigate plastic deformation mechanisms in TA15 titanium alloy. Tensile tests were conducted up to different strains at room temperature. The slip lines were observed and identified using high resolution scanning electron microscopy. Geometrically necessary dislocations were calculated based on strain gradient theories. The statisticallystored dislocations were studied using transmission electron microscopy under two beam conditions. The results indicate that the ratio of -type geometrically necessary dislocation density to -type decreases from 5 -8 to 1 -3 with increasing strain from 0.8 % to 2.0 %. The -type slip is the dominant deformation mechanism at the early stage of plastic deformation, whereas -slips become dominant with further increase in deformation strain.Keywords: Deformation mechanisms; Geometrically necessary dislocation; Slip line; Transmission electron microscopy; Electron backscatter diffraction 1. Introduction TA15, also known as Ti-6Al-2Zr-1Mo-1V, is a typical near a titanium alloy. The microstructure of TA15 is composed of dominant a lamellae (hexagonal-close-packed, hcp) and a few residual beta phases (body-centered-cubic, bcc) at room temperature [1]. Because of its high specific strength and excellent corrosion resistance at the evaluated temperature, TA15 titanium alloy is preferentially used in aviation and aerospace industries [2 -9].Generally, because of low symmetry of the hcp crystal structure and the special lamella grain morphology, the near a titanium alloy exhibits low tensile ductility, high strength and anisotropic mechanical properties compared to beta and a+b titanium alloy [10]. The deformation mechanisms in hcp metal are complex because of the competition between dislocation slip (including basal, prismatic pyramidal slip model) and twinning under different deformation conditions [11,12]. Especially, due to a relatively high Al content, twinning in alloyed TA15 tends to be suppressed and dislocation slip is the dominant plastic deformation mechanism. According to von-Mises criterion, at least five independent slip systems are required for homogeneous plastic deformation. Therefore, in addition to basal <11 20> {0002}, prismatic <11 20>{10 10} and pyramidal <11 20> {10 11} slip modes, the non-basal <11 23>{10 11} and/or {11 22} <11 23> slips are invoked [13]. However, the effect of addition slip modes on full plastic deformation of titanium and titanium alloys is still debatable [14]. Therefore, it is very important to study deformation mecha-

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Observations of lattice curvature near the interface of a deformed aluminium bicrystal

Cited by 248 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

A statistical analysis of the elastic distortion and dislocation density fields in deformed crystals

Study of plastic deformation mechanisms in TA15 titanium alloy by combination of geometrically necessary and statistically-stored dislocations

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