High-temperature superplastic behavior and ECAP deformation mechanism of two-phase Mg-Li alloy

Fine grains of Two-phase Mg-Li alloy could be achieved by severe plastic deformation. The alloy exhibited a superplastic behavior with a maximum elongation of 306.6% at 623 K with an initial rate of 1.5 x 10-2 s- 1. The value of the strain rate sensitivity under 623 K and 1.5 x 10-2s-1 is 0.36, and 121.6-160.0 kJ/mol. The dominant deformation mechanism in this alloy is grain boundary sliding accommodated by a slip which was controlled by lattice diffusion at 523-623 K.

Automated summary

The study demonstrates that fine grains of two-phase Mg-Li alloy can be achieved through severe plastic deformation, exhibiting superplastic behavior with high elongation. The dominant deformation mechanism in this alloy is grain boundary sliding controlled by lattice diffusion.