A study of recovery and primary recrystallization mechanisms in a Zr–2Hf alloy

Zhu, Kun Yan; Chaubet, D.; Bacroix, Brigitte; Brisset, François

doi:10.1016/j.actamat.2005.07.034

Cited by 84 publications

(46 citation statements)

References 12 publications

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“…The <10 1 0> preferred orientation is typical of the deformed state. This result is in agreement with the results of previous investigations on cold-rolled Zr alloys [8].…”

Section: Discussionsupporting

confidence: 83%

“…Tensile twinning accommodates the elongation along the c-axis of the crystal, whereas compressive twinning accommodates the c-axis contraction [29]. Zhu et al [8] used orientation imaging microscopy (OIM) to study the microstructure of a Zr−2Hf alloy sheet deformed by plane strain compression. 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.…”

Section: Discussionmentioning

confidence: 99%

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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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“…The <10 1 0> preferred orientation is typical of the deformed state. This result is in agreement with the results of previous investigations on cold-rolled Zr alloys [8].…”

Section: Discussionsupporting

confidence: 83%

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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“…[8][9][10][11][12][13] In the work of Gerspach et al, [11] it was shown that the fragmentation of grains has an influence upon the primary recrystallization texture following moderate strain deformation (~40 pct). [11] In these cases, oriented nucleation of new grains occurs at fragmented regions of the prior grains.…”

Section: Introductionmentioning

confidence: 99%

“…The texture's development in the latter stages of recrystallization and the overall recrystallization process is dominated by the favorable growth of specific grain orientations. [3,[8][9][10]14,15] The frequency of these specific grains following primary recrystallization will influence the texture that develops in secondary recrystallization. [8] Thus, the deformed state of the grains will influence the final recrystallization texture via its influence upon the processes taking place during primary recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Grain Breakup During Elevated Temperature Deformation of an HCP Metal

Honniball

Preuss

Rugg

et al. 2015

Metall Mater Trans A

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A combination of mechanical testing, EBSD and crystal plasticity finite element modeling were used to investigate the influence of temperature on the fragmentation of grains in a zirconium alloy. The results demonstrate that grains of Zircaloy-4 fragment more as the temperature rises. This trend can be explained by an increasing difference between the CRSS values for hc+ai slip and hai slip as temperature rises. This change in relative slip activities with temperature is supported by experimental observations of macroscopic anisotropy and in-grain misorientation axes calculated from EBSD data, as well as plasticity modeling. By tracking the microstructural evolution during deformation, it is shown that the two major texture components fragment to different degrees under the action of prismatic slip. Grains in the 1120 fiber are significantly more stable than those in the 1010 fiber, which break up. Grains of the latter fiber fragment heterogeneously as portions of the grain rotate in opposite directions, and some do not rotate at all.

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“…In particular, it has been shown by Zhu et al [1] that the microstructure of Zr-2Hf alloy strained up to 55% by plane strain compression exhibits high heterogeneity, which is characterized by the coexistence of highly deformed and less deformed zones. During annealing the classical nucleation occurs in the highly deformed areas, especially at grain boundaries and/or nearby twin intersections, then further growth of new recrystallization grains is observed.…”

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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A study of recovery and primary recrystallization mechanisms in a Zr–2Hf alloy

Cited by 84 publications

References 12 publications

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

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

Grain Breakup During Elevated Temperature Deformation of an HCP Metal

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

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