High-pressure elasticity and lattice dynamics of Mg2La from first principles

► The cubic phase of Mg2La Laves phase remains stable up to 150 GPa. ► The elastic anisotropy ratio indicates an electronic topological transition around ≈100 GPa. ► Ductility of the material increases with increasing pressure. ► Phonon dispersion spectra do not exhibit any vibrational anomaly indicating the stability of crystal structure.