The effect of loading direction and Sn alloying on the deformation modes of Zr: An in-situ neutron diffraction study

Krishna, K.V. Mani; Prakash, D.G. Leo; Timár, G.; Fitzner, Arnas; Srivastava, D.; Saibaba, N.; Fonseca, João Quinta da; Dey, G.K.; Preuss, Michael

doi:10.1016/j.msea.2015.10.047

Cited by 14 publications

(4 citation statements)

References 29 publications

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“…The observations made by Unga ´r and Regnard are similar to those made in the current study. Compression of Zr-1.2wt%Sn at room temperature along RD and TD by Mani Krishna et al 43 indicate the presence of {10 12}h10 11i tensile twinning, as observed in the current study.…”

Section: Slip System Activity In Tdsupporting

confidence: 82%

The Effect of Loading Direction on Slip and Twinning in an Irradiated Zirconium Alloy

Thomas

Lunt

Atkinson

et al. 2021

Zirconium in the Nuclear Industry: 19th International Symposium

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In this study, deformation experiments together with high-resolution digital image correlation were used to quantify the effect of proton irradiation on strain localization in Zircaloy-4 loaded along the rolling and transverse directions. Significant increases in strain heterogeneity were measured in the irradiated material compared to the nonirradiated material. This was a result of confinement of slip to channels in the irradiated material, which contain high effective shear strain values, with almost no strain in the regions between channels. The active slip systems in the material were also determined by comparing experimental slip trace angles from high-resolution digital image correlation with theoretical slip trace angles determined using grain orientation from electron backscatter diffraction. An increased amount of pyramidal and wavy basal slip, as well as tension twinning, were observed in the sample loaded along the transverse direction, compared to the sample loaded along the rolling Manuscript

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Section: Slip System Activity In Tdsupporting

confidence: 82%

The Effect of Loading Direction on Slip and Twinning in an Irradiated Zirconium Alloy

Thomas

Lunt

Atkinson

et al. 2021

Zirconium in the Nuclear Industry: 19th International Symposium

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“…Another possibility of an increase in strength of Zircaloy-4 at slower heating rates could be the effect of Sn diffusion. In fact, Sn is an α-stabilizer and likely diffuses out of β phase to α phase at high temperature and hence strengthens the α phase, similar to the increase in strength of Zircaloy-4 at higher Sn contents [43]. Hence, it is possibly that the increase in yield stress at slower heating rate is due to an increase in strength of α phase due to more diffusion of Sn at slower heating rate.…”

Section: Prediction Of Flow Stresses By Crystal Plasticity Finite Element Modelmentioning

confidence: 91%

Predicting the Flow Stress of Zircaloy-4 under In-Reactor Accident Conditions

Nguyen

Romero

Ambard

et al. 2018

Zirconium in the Nuclear Industry: 18th International Symposium

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During loss of coolant accident (LOCA) and reactivity-initiated accident (RIA), nuclear fuel rods experience high heating rates that change the microstructure and properties of zirconium cladding materials. The aim was to determine how different fast heating rates affect the kinetics of transformation and whether its consequences on the material yield stresses in the dual-phase region could be predicted. Phase fraction and texture of cold-rolled Zircaloy-4 were thus measured at fast heating rates similar to those experienced during LOCA and RIA by in-situ high-energy synchrotron x-ray diffraction; the yield stress was also measured at different heating rates to the same dual-phase temperature by electrical resistance method. Crystal plasticity finite element model was used to simulate the flow stresses with the inputs of the measured phase fraction and texture. The model is calibrated using the flow stress at the heating rate of 10ºCs -1 and used to predict the flow stress at the heating rate of 50ºCs -1 at the same temperature. A significant shift of the β transus temperature was identified for fast heating rates in the range of 10-100 o Cs -1 . There is great similarity in texture at different heating rates. In the dual-phase temperature region, the α texture is almost identical to the starting texture and the β texture is nearly random. Yield stresses of cold-rolled Zircaloy-4 decrease at faster heating rate at the same temperature of 920ºC. A good agreement was found between the experimental and predicted flow stress at

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“…We simulate the deformation in polycrystalline magnesium using a three-dimensional elasto-viscoplastic CPFE model that has previously been used to successfully predict texture evolution and intergranular stresses in interstitial free steel [26,27] and which we have also used to model the effect of texture on twin clustering [28] and to study the effect of solute content on twinning in Zr alloys [29]. A detailed description of the solution algorithm -in the context of the initial, two-dimensional version of the model -can be found in [30].…”

Section: Model Constructionmentioning

confidence: 99%

Discontinuous yielding in wrought magnesium

Timár

Barnett

Fonseca

2017

Computational Materials Science

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Recent reports of discontinuous yielding in the uniaxial compression of extruded magnesium suggest that twinning is accompanied by a significant stress decrease in the parent grain, leading to corresponding stress concentrations. We performed crystal plasticity finite element simulations using a simple twinning implementation that includes this "softening" effect for tensile twinning. With this method we were able to reproduce the experimentally observed yield point elongation and the Lüders-like propagation of strain and twinning over the sample. Twin variant selection was analysed in detail at various stages of deformation. Although lower rank variants were found to be activated, most of the twinning activity occurred on variants with the highest global Schmid factor. The stress fluctuations arising from the stress relaxation due to twinning did not appear to alter the dominance of the highest Schmid factor variant significantly. However, when twin softening is included, the twinning strain is dominated by a single variant. Despite giving rise to the highest stress fluctuations during yielding, simulations using the twin stress relaxation implementation actually showed less heterogeneity in stress after yielding. The results of our simple model suggest that "twin softening" could be key to the development of discontinuous yielding in extruded magnesium alloys.

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The effect of loading direction and Sn alloying on the deformation modes of Zr: An in-situ neutron diffraction study

Cited by 14 publications

References 29 publications

The Effect of Loading Direction on Slip and Twinning in an Irradiated Zirconium Alloy

The Effect of Loading Direction on Slip and Twinning in an Irradiated Zirconium Alloy

Predicting the Flow Stress of Zircaloy-4 under In-Reactor Accident Conditions

Discontinuous yielding in wrought magnesium

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