Influence of precipitates on basal dislocation slip and twinning in AZ91 micro-pillars

S. Si, J. Wu, I. P. Jones, Y. L. Chiu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Micro-pillars of solution-treated and aged AZ91 magnesium alloy (Mg-9Al-0.7Zn-0.2Mn) have been used to study the influence of precipitates on plastic deformation mechanisms. The micro-pillars were compressed along (Formula presented.) and (Formula presented.) directions in order to activate basal slip and (Formula presented.) twinning, respectively. The critical resolved shear stresses were determined. Precipitates had limited strengthening effect on basal slip, but increased significantly the stress required for twin growth. The precipitates are engulfed by the tension twins during deformation. The back stress generated due to the presence of the precipitates is expected to provide a considerable contribution to strengthening which slows the twin growth. A high density of stacking faults was observed in the aged specimen, particularly in between the precipitates, which may hinder dislocation glide upon further deformation.

Original languageEnglish
Pages (from-to)2949-2971
JournalPhilosophical Magazine
Issue number23
Publication statusAccepted/In press - 2020


  • CRSS
  • dislocation
  • Magnesium
  • micro-pillar compression
  • twinning

ASJC Scopus subject areas

  • Condensed Matter Physics


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