Room temperature equal-channel angular pressing of a magnesium alloy

Abstract : Equal-channel angular pressing (ECAP) of magnesium alloy Mg-3Al-1Zn (wt.%) has been carried out at room temperature by applying a back-pressure three times larger than the yield stress in a 90 degrees die. In a single pass, the initial grain size of similar to 10 mu m originating from twin-roll casting was reduced down to similar to 3 mu m. \1 0 (1) over bar 2\ tensile twins were observed by orientation imaging up to similar to 40% volume fraction in grains that remained relatively high after ECAP. Regions with small grain size did not show twinning. The small lattice curvatures indicated that dynamic recovery/recrystallization took place during testing. The 90 degrees ECAP deformation field was approximated by two-stage simple shear due to a large dead metal zone appearing at the outer corner of the die. Using this strain path, the viscoplastic self-consistent (VPSC) model was employed to model the texture evolution in the version where a parameter (alpha) tunes the interaction equation between a grain and the homogeneous equivalent medium. The textures were reproduced in good accord with experiments only if the alpha parameter corresponded to the Tangent VPSC model. Twinning was simulated in a quantitative way by introducing the volume transfer scheme in the VPSC model without employing a criterion for selection of the six possible twin variants.
Type de document :
Article dans une revue
Acta Materialia, Elsevier, 2013, 61 (8, SI), pp.3027-3036. 〈10.1016/j.actamat.2013.01.063〉
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C. F. Gu, Laszlo S. Toth, D. P. Field, Jean-Jacques Fundenberger, Yu Dong Zhang. Room temperature equal-channel angular pressing of a magnesium alloy. Acta Materialia, Elsevier, 2013, 61 (8, SI), pp.3027-3036. 〈10.1016/j.actamat.2013.01.063〉. 〈hal-01502116〉



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