Abstract:Deformation mechanism maps for binary Mg-(8~9)Li(mass fraction, %) alloy at 423~623K were constructed in order to elucidate the internal meaning of mechanical experimental data at elevated temperatures. The models and data source used for constructing maps and constructed results are presented. It is determined through comparison of mechanical experimental data with constructed deformation mechanism maps that the dominant deformation mechanism for such alloy at 423~623K is lattice diffusion controlled grain boundary sliding. The difference of such deformation mechanism maps from former ones is that dislocation quantity inside the grains participates in the model calculation, which reveals the dislocation features of different deformation mechanisms.

Key words:   magnesium alloy; dislocation; superplasticity; creep