|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Mechanical Properties and Tribocorrosion Behaviors of TiNbTaZr-based High-entropy Alloys for Biomedical Applications
||Shih-Chieh Chao, Kuan-Cheng Lai, Po-Yu Chen
|On-Site Speaker (Planned)
Conventional CoCrMo and Ti6Al4V alloys have been used as metallic biomaterials. However, metal ions released from CoCrMo alloy caused cytotoxicity and Ti6Al4V alloy had insufficient wear resistance. In order to integrate biocompatibility characteristics with unique properties of high-entropy alloys, such as high strength, outstanding structural stability and excellent corrosion and wear resistance, we synthesized MoNbTaTiZr and MoNbTaTiZrV HEAs by arc-melting for biomedical applications. The CALPHAD calculations revealed that the as-casted equiatomic MoNbTaTiZr and MoNbTaTiZrV HEAs possessed dual bcc phases confirmed by X-ray diffraction (XRD). Electron probe X-ray microanalysis (EPMA) results showed that tantalum, molybdenum and niobium were concentrated in dendritic arms while titanium and zirconium were enriched in interdendrite regions. Nanoindentation results showed that MoNbTaTiZr HEAs possessed hardness of 7.10.8 GPa and reduced modulus of 137.112.0 GPa. Biocompatibility, Wear resistance, tribocorrosion behaviors and metal ions released in PBS solution of HEAs are investigated and compared to commercial implants.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume