The excellent mechanical properties of high-entropy materials make them promising materials for advances in science and technology. However, their behavior under high pressure and the underlying mechanism of their deformation is not well understood. Here, we in-situ studied the deformation behavior of high-entropy alloy MoNbTaVW and high-entropy oxide MgCoNiCuZnO under high pressure via radial x-ray diffraction in a diamond anvil cell (rDAC-XRD).  By comparing with metal W, it’s proved that the active dislocation behavior is mainly responsible for the high strength in MoNbTaVW under compression. A possible slip system transition process is also proposed for MgCoNiCuZnO based on the lattice strain and texture evolution under high pressure. In the meantime, a series of high-entropy carbides and nitrides have been synthesized. Their compressibility and phase stability have been investigated via axial x-ray diffraction under high pressure.

high entropy,mechanical property,high pressure,deformation behavior