Unique deformation behavior and microstructure evolution in high-temperature processing of a low-density TiAlVNb2 refractory high-entropy alloy

• Hot deformation behavior of a low-density refractory high-entropy alloy was studied. • The apparent activation energy for hot-deformation was 401–375 kJ ∙ mol − 1 . • A combined DDRX+CDRX process takes place in this novel alloy in hot deformation. Thermal deformation behaviors and microstructure evolution of a novel light refractory high-entropy alloy (RHEA) TiAlVNb 2 were investigated in detail. Uniaxial compression was implemented at...