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Precipitate strengthening of pyramidal slip in Mg–Zn alloys

Alizadeh, R ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2020.140697
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. The mechanical properties of Mg-4wt.% Zn alloy single crystals along the [0001] orientation were measured through micropillar compression at 23 °C and 100 °C. Basal slip was dominant in the solution treated alloy, while pyramidal slip occurred in the precipitation hardened alloy. Pyramidal dislocations pass the precipitates by forming Orowan loops, leading to homogeneous deformation and to a strong hardening. The predictions of the yield stress based on the Orowan model were in reasonable agreement with the experimental data. The presence of rod-shape precipitates perpendicular to the basal plane leads to a strong reduction in the plastic anisotropy of Mg. © 2020 Elsevier B.V
  6. Keywords:
  7. Crystal orientation ; Hardening ; Precipitation (chemical) ; Yield stress ; Hardened alloy ; Homogeneous deformation ; Micro-pillar compressions ; Orowan model ; Plastic anisotropy ; Precipitate strengthening ; Pyramidal slip ; Solution-treated alloys ; Zinc alloys
  8. Source: Materials Science and Engineering A ; Volume 804 , 2021 ; 09215093 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0921509320317603