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High strain rate deformation mechanism of Mg–2.5Zn–4Y magnesium alloy containing LPSO phase

ABSTRACT Dynamic compression experiments were carried out on Mg–2.5Zn–4Y magnesium alloy containing long period stacking ordered phase (LPSO) to understand its deformation mechanism using ‘Split Hopkinson Pressure Bar’. High strain rates ranging from 700 to 2100 s−1 were applied along Extrusion Direction. The results demonstrate that maximum compression stress increases with increasing strain rate. In the mean the alloy shows a positive strain rate strengthening effect. The deformation mechanism of Mg–2.5Zn–4Y magnesium alloy with LPSO phase is mainly 〈c + a〉 pyramidal slip supplemented with deformation by extension twin in association with kinking of LPSO phase. The impact fracture surface of the investigated magnesium alloy suggested quasi-cleavage fracture.