Experimental and Predicted Texture Evolutions in Zirconium Alloys Deformed in Channel Die Compression

Plastic flow anisotropy of pure zirconium after severe plastic deformation at room temperature

“…Therefore, similarity in ECAE textures for a variety of hcp materials is likely a result of the operation of basal slip. Last, other polycrystal modeling studies [14,[44][45][46][47][48] have also found the need for basal slip for effective texture predictions in cold-worked pure Zr and its alloys [45], high-strain compression of Zr-2.5Nb [44], and channel die compression of Zr702 [48]. In the latter, the Zr702 samples had a strong initial texture and using optical microscopy basal slip traces were identified at 20% plastic strain at room temperature.…”

An Anisotropic Behaviour Analysis of AA2024 Aluminium Alloy Undergoing Large Plastic Deformations

“…On the experimental point of view the many researches describe the rolled sheet properties of aluminium alloys (Choi & Barlat, 1999), (Li et al, 2004), (Park, 1999)) and report the anisotropic response during the mechanical deformation from uniaxial tensile tests, wire drawing or simple shear ones ( (Fjeldl & Roven , 1996), (Hu et al, 1998), (Lloyd & Kenny, 1980), (Yonn, 2005)). Until now relatively few studies concerns the use of the channel die compression test, where deformation history is close of the principal sheet forming process such as the cold rolling one (Francillette et al, 1998). In this study an aluminium alloy (AA2024) is analyzed in order to characterize its anisotropy and its mechanical behaviour with this latter mechanical test.…”

Strain localization and failure in irradiated zircaloy with crystal plasticity

“…Francillete et al [22] In the polycrystal calculations, the negative planes are restrained to be planar in order to impose (uniaxial) constraint on the deformation, and the positive planes are unconstrained in order to be representative of free surfaces. This is unlikely to be key in determining the role and necessity of prismatic softening in Zr softening in addition to basal softening.…”

“…4b. A fixed ratio, presented by Francillette et al [22], is adopted between the relative slip system strengths during calibration such that 0 basal = 1.3 0 pris and 0 pyra = 4 0 pris . A detailed discussion is presented in Appendix A to compare the range of CRSS values for individual slip systems reported in the literature for Zircaloys, together with a polycrystal model assessment of the consequent macro-level uniaxial stress-strain response which results.…”

“…Appendix A: Methodology to calibrate slip system strength Slip strengths determined in this study together with others reported in the literature are presented in Table 2, some of which have been determined from 'highly' textured polycrystal tests [22,26], and others from single-crystal microcantilever test measurements [27]. The potential problem of the latter is that these measurements are potentially size-dependent, but in [24], size dependency has been removed.…”