A novel Hf30Nb25Ta25Ti15Mo5 refractory high entropy alloy with excellent combination of strength and ductility

A novel Hf30Nb25Ta25Ti15Mo5 refractory high entropy alloy (RHEA) with BCC structure has been proposed. The compressive yield strength, fracture strain and fracture toughness at room temperature are 964 ± 16 MPa, > 50% and 94.7 ± 1.4 MPa m1/2, respectively. Compared with most BCC-type RHEAs, this alloy exhibits the superior combination of strength, ductility and fracture toughness.