Ultrahigh hardness and biocompatibility of high-entropy alloy TiAlFeCoNi processed by high-pressure torsion.
Mater Sci Eng C Mater Biol Appl
; 112: 110908, 2020 Jul.
Article
en En
| MEDLINE
| ID: mdl-32409062
ABSTRACT
Despite significant studies on mechanical properties of high-entropy alloys (HEAs), there have been limited attempts to examine the biocompatibility of these alloys. In this study, a lattice-softened high-entropy alloy TiAlFeCoNi with ultrahigh hardness (examined by Vickers method), low elastic modulus (examined by nanoindentation) and superior activity for cell proliferation/viability/cytotoxicity (examined by MTT assay) was developed by employing imperial data and thermodynamic calculations. The designated alloy after casting was processed further by high-pressure torsion (HPT) to improve its hardness via the introduction of nanograins, dislocations and order-disorder transformation. The TiAlFeCoNi alloy with the L21-BCC crystal structure exhibited 170-580% higher hardness and 260-1020% better cellular metabolic activity compared to titanium and Ti-6Al-7Nb biomaterials, suggesting the high potential of HEAs for future biomedical applications.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Materiales Biocompatibles
/
Aleaciones
Límite:
Animals
Idioma:
En
Revista:
Mater Sci Eng C Mater Biol Appl
Año:
2020
Tipo del documento:
Article
País de afiliación:
Japón