Texture dependent plastic behavior of Zr 702 at large strain

Castelnau, Olivier; Francillette, H.; Bacroix, Brigitte; Lebensohn, Ricardo A.

doi:10.1016/s0022-3115(01)00589-x

Cited by 52 publications

(28 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of course, these parameters will simultaneously depend on the selected model and on the values of the critical resolved shear stresses for each slip family, which are still not well known for hexagonal materials. [15,22] If for the cubic materials, most of the widely used models (fullconstraints Taylor, relaxed constraints, or self-consistent model) give predictions that are generally quite close, the situation is different for hexagonal materials, for which none of the existing models can reproduce simultaneously the texture evolution and a realistic estimation of the activities of the various possible systems. For that reason, we used here the Taylor model, which, because of its simplicity, allows an extensive study of the influence of critical resolved shear stress (CRSS) on the activity of the various possible deformation mechanisms, although it is known to overestimate the activity of some secondary slip systems.…”

Section: B Comparison Of These Se Measurements With Some Theoreticalmentioning

confidence: 99%

“…[23] The results, in terms of the Taylor factor and activities of the various deformation systems, are presented in Table III for a typical selection of CRSS values. [22,24] The complete analysis of these data and of all the other numerical tests that were performed call for the following comments.…”

Section: B Comparison Of These Se Measurements With Some Theoreticalmentioning

confidence: 99%

See 1 more Smart Citation

Texture Evolution and Associated Nucleation and Growth Mechanisms during Annealing of a Zr Alloy

Zhu

Bacroix

Chauveau

et al. 2009

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

The evolution of the crystallographic texture in a Zr-2Hf alloy has been followed during deformation, primary recrystallization, and subsequent normal grain growth. The rolling textures (from 50 to 90 pct strain) are constituted of two partial orientation fibers, D f = {hkil}h10 " 10i and R f = {hkil}h11 " 20i; along which the two main orientations are the socalled ''tilted'' {0001}h10 " 10i and tilted {0001}h11 " 20i texture components for which the {0001} poles are approximately 25 deg away from the specimen normal direction (ND). A decrease in the intensity of the D f fiber and a continuous increase in the intensity of the R f fiber take place during primary recrystallization and normal grain growth. An analysis of the neutron diffraction line profiles reveals a stored energy (SE) difference between the main orientations of these two texture fibers after deformation. These observations as well as some considerations about the possible active deformation systems and some partial observations of the nucleation and growth states allow us to propose possible mechanisms to explain the observed texture evolution.

show abstract

Section: B Comparison Of These Se Measurements With Some Theoreticalmentioning

confidence: 99%

Section: B Comparison Of These Se Measurements With Some Theoreticalmentioning

confidence: 99%

Texture Evolution and Associated Nucleation and Growth Mechanisms during Annealing of a Zr Alloy

Zhu

Bacroix

Chauveau

et al. 2009

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

show abstract

“…As deformation proceeds, the reference shear stresses evolve owing to the evolution of the dislocation density (typically, t (k) 0(r) is considered to be proportional to the square root of the dislocation density [e.g., see Kocks, 1976], although we will not go that deep in the physical interpretation here). We consider a simple and standard form for the hardening/ softening law [Bronkhorst et al, 1992;Castelnau et al, 2001]…”

Section: à5mentioning

confidence: 99%

Elastoviscoplastic micromechanical modeling of the transient creep of ice

et al. 2008

Self Cite

View full text Add to dashboard Cite

[1] A salient feature of the rheology of isotropic polycrystalline ices is the decrease of the strain rate by more than 2 orders of magnitude during transient creep tests to reach a secondary creep regime at a strain which is systematically of $1%. We use a recent (socalled ''affine'') version of the self-consistent mean-field theory to model the elastoviscoplastic behavior of ice. The model aims at bridging scales between the rheology of single grain and the one of polycrystals by evaluating the intergranular interactions. It takes into account the long-term memory effects, which manifests itself by the fact that local stress and strain rate in grains depend on the whole mechanical history of the polycrystal. It is shown that the strong hardening amplitude during the transient creep is entirely explained by the stress redistribution within the specimen, from an almost uniform stress distribution upon instantaneous loading (purely elastic response) to strong interphase and intraphase heterogeneities in the stationary regime (purely viscoplastic response). The experimental hardening kinetic is much too slow to be explained by the same process; it is attributed to the hardening of hard glide slip systems (prismatic slip) in the transient regime. Moreover, the model very well reproduces the permanent creep rate of several highly anisotropic specimens of the Greenland Ice Core Project ice core (pronounced crystallographic textures), when accounting for a single-grain rheology that well matches the experimental one. Our results are consistent with recent findings concerning dislocation dynamics in ice.

show abstract

“…Numerous researchers have attempted to understand the evolution of microstructure and texture during the cold rolling and annealing of Zr alloys [4−17]. Castelnau et al [17] studied the texture development of Zr 702 with different initial textures. They observed that the orientation dependence of the activated slip systems was strongly influenced by the texture and that intracrystalline hardening did not substantially affect the development of texture.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and texture evolution in commercial-purity Zr 702 during cold rolling and annealing

Tan

et al. 2014

Int J Miner Metall Mater

View full text Add to dashboard Cite

Microstructure and texture evolution in commercial-purity Zr 702 during cold rolling and annealing was investigated by optical microscopy, transmission electron microscopy, and X-ray diffraction. The results showed that crystallographic slip was the predominant deformation mechanism in the early stage of deformation. Deformation twins started to form when the rolling reduction was larger than 38.9%; both the dislocation density and the number of twins increased with increasing rolling reduction. The initial texture of the Zr 702 plate consisted of the basal fiber component. During cold rolling the strength of the basal fiber first decreased and then increased with increasing rolling reduction. The cold-rolled sheets were fully recrystallized after being annealed at 550°C. The recrystallization temperature and the size of recrystallized grains decreased with increasing rolling reduction. A larger rolling reduction resulted in a higher grain growth rate when the annealing temperature increased from 550°C to 700°C. The recrystallization texture was characterized by a major basal fiber and a minor {01 1 3}<2 1 1 0> component. The strength of the recrystallization texture increased with increasing rolling reduction.

show abstract

Texture dependent plastic behavior of Zr 702 at large strain

Cited by 52 publications

References 36 publications

Texture Evolution and Associated Nucleation and Growth Mechanisms during Annealing of a Zr Alloy

Texture Evolution and Associated Nucleation and Growth Mechanisms during Annealing of a Zr Alloy

Elastoviscoplastic micromechanical modeling of the transient creep of ice

Microstructure and texture evolution in commercial-purity Zr 702 during cold rolling and annealing

Contact Info

Product

Resources

About