Effects of grain size on dislocation organization and internal stresses developed under tensile loading in fcc metals

Feaugas, X.; Haddou, H.

doi:10.1080/14786430601019441

Cited by 64 publications

(24 citation statements)

References 112 publications

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“…However, the cell dislocation structures are significantly affected by the crystallographic orientations, grain size and s.f.e. [24][25][26] It has been found that the cell microstructure can be subdivided into three types: long dislocation cells with {111} crystallographic walls (Type I), equiaxed dislocation cells (Type II) and long X. Feaugas and P. Pilvin/A Polycrystalline Approach to the Cyclic Behaviour of f.c.c. Alloys .…”

Section: Dislocation Patterns and Hardening Stagesmentioning

confidence: 99%

“…is the main reason for the decrease of intra-granular hardening. [26] Stage IV is rarely reached during cyclic loading because the plastic strain amplitude is too high to prevent fracture (e pa > 1.5% in AISI 316L). The dislocation microstructures typical of this stage are cells disoriented to each other and sometimes twins in low s.f.e.…”

Section: Review Dislocation Cells With Non-crystallographic Walls (Tymentioning

confidence: 99%

“…[6][7][8][9][10]12,[14][15][16]26,[32][33][34] This approach leads to the formulation of the internal intra-granular, which will either slow down or assist dislocation mobility in relation to the direction of the solicitation. [8] All these considerations can be integrated into a polycrystalline approach of the f.c.c.…”

Section: Polycrystalline Model Based On Dislocation Mechanismsmentioning

confidence: 99%

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A Polycrystalline Approach to the Cyclic Behaviour of f.c.c. Alloys – Intra‐Granular Heterogeneity

Feaugas

Pilvin

2009

Adv Eng Mater

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For several decades, the plastic deformation mechanisms of f.c.c. metals under cyclic loading have received considerable attention. The extensive work on this subject has gradually lead to the identification of the physical processes to be included in a formal scheme of fatigue behavior. Accordingly, we propose a review of the physical mechanisms of plastic deformation in f.c.c. metals and alloys to define the state‐of‐the‐art and motivate future studies. The aim is to demonstrate the importance of a good knowledge of the heterogeneous nature of deformation at the intra‐granular scale in defining a physical model of cyclic behavior. A large characterization of the different stages associated with the evolution of heterogeneous dislocation structures during tensile and cyclic loadings is given for an austenitic stainless steel AISI 316L. A unified view of these various structures is proposed in the form of a modified Pedersen's map [εmax = f(εpcum), where εmax is the maximum plastic strain and εpcum the cumulative plastic strain] in the case of tensile loading and different kinds of cyclic loading: uni‐axial and multi‐axial tests under stress or strain amplitude control. The specificities of each domain defined in the map are discussed in terms of long‐range internal stresses in order to formalize, in a simple composite scheme, the intra‐granular stress–strain field. The importance of taking into account this scheme and the nature of the different dislocations populations in a polycrystalline model is illustrated.

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Section: Dislocation Patterns and Hardening Stagesmentioning

confidence: 99%

Section: Review Dislocation Cells With Non-crystallographic Walls (Tymentioning

confidence: 99%

Section: Polycrystalline Model Based On Dislocation Mechanismsmentioning

confidence: 99%

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A Polycrystalline Approach to the Cyclic Behaviour of f.c.c. Alloys – Intra‐Granular Heterogeneity

Feaugas

Pilvin

2009

Adv Eng Mater

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“…Therefore, any grain containing less than three dislocation lines for each of its potential slip systems was assumed to carry no plastic deformation. This semi-statistical approach has previously demonstrated its interest in different strengthening materials such as titanium alloys [19][20][21], zirconium alloys [22], austenitic stainless steel [23] and nickel [18,24].…”

Section: Transmission Electron Microscopy Methodsmentioning

confidence: 99%

Microstructural characterization of creep anisotropy at 673 K in the M5® alloy

et al. 2012

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“…For the small fraction, the heterogeneity of the path length is very high, in contrast to the high fraction where the path lengths are characterized by a homogeneous distribution. In order to compare different probability distributions, scaling hypothesis has been applied in many cases [49,50]. The same approach was used in the current work.…”

Section: Path Length Distributionsmentioning

confidence: 96%

Effects of grain-boundary networks on the macroscopic diffusivity of hydrogen in polycrystalline materials

Hoch

Metsue

Bouhattate

et al. 2015

Computational Materials Science

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Effects of grain size on dislocation organization and internal stresses developed under tensile loading in fcc metals

Cited by 64 publications

References 112 publications

A Polycrystalline Approach to the Cyclic Behaviour of f.c.c. Alloys – Intra‐Granular Heterogeneity

A Polycrystalline Approach to the Cyclic Behaviour of f.c.c. Alloys – Intra‐Granular Heterogeneity

Microstructural characterization of creep anisotropy at 673 K in the M5® alloy

Effects of grain-boundary networks on the macroscopic diffusivity of hydrogen in polycrystalline materials

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