Grain orientation effects in Zr702α polycrystalline samples deformed in channel die compression at room temperature

Francillette, H.; Bacroix, Brigitte; Gaspérini, M.; Béchade, Jean-Luc

doi:10.1016/s1359-6454(98)00121-9

Cited by 47 publications

(33 citation statements)

References 8 publications

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“…Other samples were cold rolled by successive reduction steps of 3 pct down to the final thickness corresponding to a reduction ratio of 90 pct. It was confirmed in a previous study [15] that the active deformation mechanisms and associated texture evolution were, indeed, comparable in both deformation modes. In order to investigate the texture evolution during primary recrystallization, some samples were then heat treated at 530°C for 4,8,16,45, and 180 minutes under high-quality vacuum (<5AE10 À6 mbar) after deformation.…”

Section: A Materials and Sample Preparationsupporting

confidence: 85%

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

Zhu

Bacroix

Chauveau

et al. 2009

Metall Mater Trans A

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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.

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Section: A Materials and Sample Preparationsupporting

confidence: 85%

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

Zhu

Bacroix

Chauveau

et al. 2009

Metall Mater Trans A

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“…It has to be mentioned that this experiment is quite close to the one performed by Francillette et al [5], which revealed a strong influence of the initial texture on the activated slip/twin systems, resulting hardening curve and level of macroscopic stress. They noticed that the soft samples correspond mainly to the activation of easy prismatic glide systems, which is related with a linear character of the hardening curve.…”

Section: Methodssupporting

confidence: 88%

“…The investigation is based on EBSD analysis of experiments similar to the one conducted by Francillette et al [5], which is then supported by computer simulations of a Monte Carlo Potts model.…”

Section: Introductionmentioning

confidence: 99%

Investigation of SIBM driven recrystallization in alpha Zirconium based on EBSD data and Monte Carlo modeling

Jędrychowski

Bacroix²,

Salman³

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The work focuses on the influence of moderate plastic deformation on subsequent partial recrystallization of hexagonal zirconium (Zr702). In the considered case, strain induced boundary migration (SIBM) is assumed to be the dominating recrystallization mechanism. This hypothesis is analyzed and tested in detail using experimental EBSD-OIM data and Monte Carlo computer simulations. An EBSD investigation is performed on zirconium samples, which were channel-die compressed in two perpendicular directions: normal direction (ND) and transverse direction (TD) of the initial material sheet. The maximal applied strain was below 17%. Then, samples were briefly annealed in order to achieve a partly recrystallized state. Obtained EBSD data were analyzed in terms of texture evolution associated with a microstructural characterization, including: kernel average misorientation (KAM), grain orientation spread (GOS), twinning, grain size distributions, description of grain boundary regions. In parallel, Monte Carlo Potts model combined with experimental microstructures was employed in order to verify two main recrystallization scenarios: SIBM driven growth from deformed sub-grains and classical growth of recrystallization nuclei. It is concluded that simulation results provided by the SIBM model are in a good agreement with experimental data in terms of texture as well as microstructural evolution.

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“…Prismatic slip is active over the whole temperature range, whereas pyramidal slip is active at and above room temperature [23−24]. Several works have demonstrated the possible activation of basal slip {0001}<11 2 0> [25]. Basal slip at room temperature is associated with basal screw dislocations and the cross slip between basal and prismatic planes [26].…”

Section: Discussionmentioning

confidence: 99%

“…They observed that the most frequent twins are the {10 1 2}<10 1 1 > and {11 2 1}<11 2 6 > systems, whereas the {11 2 2}<11 2 3 > and {10 1 1}<10 1 2 > systems are less frequent. The formation of deformation twins depends strongly on the exact orientation of the deformed grains [25]. When the c-axis lies closer to the TD, twinning is often active, producing a small extension along TD and a small compression along RD within the twinned grain.…”

Section: Discussionmentioning

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

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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.

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Grain orientation effects in Zr702α polycrystalline samples deformed in channel die compression at room temperature

Cited by 47 publications

References 8 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

Investigation of SIBM driven recrystallization in alpha Zirconium based on EBSD data and Monte Carlo modeling

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

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