Hot shear deformation constitutive analysis of an extruded Mg–6Li–1Zn alloy

The hot shear deformation behavior of an extruded Mg–6Li–1Zn alloy was investigated by shear punch test (SPT) in the temperature range 473–573 K, and in the shear strain rate range 1.2 × 10− 3–6.0 × 10− 2 s− 1. Based on the constitutive analysis of the SPT data, it was found that a sine hyperbolic function could properly describe the hot shear deformation behavior of the material. The activation energy of 90–110 kJ mol− 1 calculated from sine hyperbolic function together with the power-law stress exponents of 3.8–5.4 is indicative of a pipe‐diffusion‐controlled dislocation viscous glide mechanism as an operative deformation mechanism.

► Shear punch test was used to evaluate hot deformation behavior of an Mg–Li–Zn alloy.
► A sine hyperbolic function properly describes the hot shear deformation behavior.
► Deformation mechanism was pipe-diffusion-controlled dislocation viscous glide.
► Deformation microstructure in sheared zone was sensitive to the Z-parameter.