Synthesis of biocompatible high-entropy alloy TiNbZrTaHf by high-pressure torsion

High-entropy alloys (HEAs), a novel type of materials with high configurational entropy, have aroused huge interest due to promising range functional properties including biocompatibility. In this study, the high-pressure torsion (HPT) method was implemented as mechanical alloying route synthesize biocompatible nanostructured HEAs bcc structure. An equiatomic quinary TiNbZrTaHf HEA successfully synthesized via HPT and its characteristics were compared binary TiNb, ternary TiNbZr quaternary TiNbZrTa an insight into effect entropy on microstructure these biomaterials. The grain size decreased, strain-rate sensitivity reduced, hardness increased increasing number principal elements from 2 3, but variations became less significant further increase in entropy. Small nanograins, solid solution hardening, dislocation activity together led 564 Hv moderate elastic modulus 79 GPa which are for biomedical applications.