TY - CHAP

T1 - Effect of ECAP Process on the Activation of Deformation Mechanisms During Subsequent Uniaxial Tension of Mg-ZEWK2000 Sheets

AU - Victoria-Hernandez, José

AU - Cano-Castillo, Guadalupe

AU - Böhm, Viktor

AU - Gruber, Maximilian

AU - Volk, Wolfram

AU - Ben Khalifa, Noomane

AU - Letzig, Dietmar

N1 - Conference code: 14

PY - 2024

Y1 - 2024

N2 - The present work investigates the influence of two different processing routes on mechanical behavior of Mg-Zn-Nd-Y-Zr (ZEWK2000) Mg sheets. Hot-rolled sheets, with dimensions of 200 × 200 × 1.8 mm3, were processed at 225 ℃ by a two equal channel angular pressing (ECAP) passes following the route DC2 with a rotation of 90° around the normal direction (ND) of the sheet. Shear deformation applied by ECAP weakens the texture and promotes a broad angular distribution of basal planes in the pressing direction. The resulting crystallographic texture promotes a change of the balance of active deformation mechanisms, i.e. slip of dislocations and twinning, during subsequent uniaxial deformation. To assess the effect of texture changes on the activation of slip systems, a systematic analysis of the slip traces after uniaxial tension of ECAP processed samples at room temperature was carried out. The analysis reveals the profuse activation of additional slip systems than the common basal <a> slip and pyramidal II <c+a>, where non-basal slip such as prismatic <a>, pyramidal <a> and pyramidal I<c +a> played a major role than expected in the rolled sheet. The relative activity of deformation mechanisms was significantly changed in the ECAP processed sheet, where extension twinning, basal <a>, pyramidal I <c+a> and pyramidal II <c+a> slip dominated the deformation. Overall, the activation of extension twinning in the ECAP processed sheet is beneficial for the reduction of anisotropy and the improvement of formability of the processed samples.

AB - The present work investigates the influence of two different processing routes on mechanical behavior of Mg-Zn-Nd-Y-Zr (ZEWK2000) Mg sheets. Hot-rolled sheets, with dimensions of 200 × 200 × 1.8 mm3, were processed at 225 ℃ by a two equal channel angular pressing (ECAP) passes following the route DC2 with a rotation of 90° around the normal direction (ND) of the sheet. Shear deformation applied by ECAP weakens the texture and promotes a broad angular distribution of basal planes in the pressing direction. The resulting crystallographic texture promotes a change of the balance of active deformation mechanisms, i.e. slip of dislocations and twinning, during subsequent uniaxial deformation. To assess the effect of texture changes on the activation of slip systems, a systematic analysis of the slip traces after uniaxial tension of ECAP processed samples at room temperature was carried out. The analysis reveals the profuse activation of additional slip systems than the common basal <a> slip and pyramidal II <c+a>, where non-basal slip such as prismatic <a>, pyramidal <a> and pyramidal I<c +a> played a major role than expected in the rolled sheet. The relative activity of deformation mechanisms was significantly changed in the ECAP processed sheet, where extension twinning, basal <a>, pyramidal I <c+a> and pyramidal II <c+a> slip dominated the deformation. Overall, the activation of extension twinning in the ECAP processed sheet is beneficial for the reduction of anisotropy and the improvement of formability of the processed samples.

KW - Crystallographic texture

KW - Deformation mechanisms

KW - ECAP

KW - Magnesium alloys

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85174437043&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/35ad897d-0fd2-3203-9a9a-2d2d12c54393/

U2 - 10.1007/978-3-031-42093-1_72

DO - 10.1007/978-3-031-42093-1_72

M3 - Article in conference proceedings

AN - SCOPUS:85174437043

SN - 978-3-031-42092-4

VL - 4

T3 - Lecture Notes in Mechanical Engineering

SP - 744

EP - 753

BT - Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity

A2 - Mocellin, Katia

A2 - Bouchard, Pierre-Olivier

A2 - Bigot, Régis

A2 - Balan, Tudor

PB - Springer International Publishing AG

CY - Cham

T2 - 14th International Conference on the Technology of Plasticity - ICTP 2023

Y2 - 24 September 2023 through 29 September 2023

ER -