TY - JOUR

T1 - Understanding the enhanced corrosion performance of two novel Ti-based biomedical high entropy alloys

AU - Ozdemir, H. C.

AU - Nazarahari, A.

AU - Yilmaz, B.

AU - Unal, U.

AU - Maier, H. J.

AU - Canadinc, D.

AU - Bedir, E.

AU - Yilmaz, R.

N1 - Funding Information: This project was funded by The Scientific and Technological Research Council of Türkiye (TÜBİTAK) within the 1002a program and grant number 112M945 . The authors thank Dr. Hadi Jahangiri for his help with the XRD measurements, Dr. Gulsu Simsek for her help with the ICP-MS analyses, and Dr. Mustafa Baris Yagci for his assistance with XPS measurements conducted at the Koc University Surface Science and Technology Center (KUYTAM). D. Canadinc acknowledges the support by Alexander von Humboldt Foundation within the scope of the Humboldt Research Award. H.J. Maier acknowledges financial support by Deutsche Forschungsgemeinschaft (project # 426335750 ).

PY - 2023/9/15

Y1 - 2023/9/15

N2 - The microstructure and corrosion behavior of two novel biomedical high entropy alloys (HEA)s, namely Hf27Nb12Ta10Ti23Zr28 and Hf30Nb14Ta10Ti28Zr18 that were previously designed utilizing machine learning, were investigated in depth. The microstructure of the alloys was determined to be dendritic, with some elemental segregations governed by the solidification kinetics occurring during the arc-melting process. Static immersion experiments were carried out in artificial saliva (AS) and simulated body fluid (SBF) to investigate the ion release behavior of the HEAs and reveal the dissolution kinetics of the passive film forming on the surface. The composition of the corresponding surface oxide layers was examined using X-ray photoelectron spectroscopy, which provided detailed insight into the stability of passive oxide layers and sub-oxide formation. Potentiodynamic polarization experiments performed in AS and SBF at 37 ºC demonstrated that both HEAs exhibit superior corrosion behavior as compared to the CoCrMo alloy, one of the conventional metallic implant materials of choice.

AB - The microstructure and corrosion behavior of two novel biomedical high entropy alloys (HEA)s, namely Hf27Nb12Ta10Ti23Zr28 and Hf30Nb14Ta10Ti28Zr18 that were previously designed utilizing machine learning, were investigated in depth. The microstructure of the alloys was determined to be dendritic, with some elemental segregations governed by the solidification kinetics occurring during the arc-melting process. Static immersion experiments were carried out in artificial saliva (AS) and simulated body fluid (SBF) to investigate the ion release behavior of the HEAs and reveal the dissolution kinetics of the passive film forming on the surface. The composition of the corresponding surface oxide layers was examined using X-ray photoelectron spectroscopy, which provided detailed insight into the stability of passive oxide layers and sub-oxide formation. Potentiodynamic polarization experiments performed in AS and SBF at 37 ºC demonstrated that both HEAs exhibit superior corrosion behavior as compared to the CoCrMo alloy, one of the conventional metallic implant materials of choice.

KW - Corrosion resistance

KW - High-entropy alloys

KW - Microstructure

KW - Passive oxide layer

KW - Polarization

UR - http://www.scopus.com/inward/record.url?scp=85156239259&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2023.170343

DO - 10.1016/j.jallcom.2023.170343

M3 - Article

AN - SCOPUS:85156239259

VL - 956

JO - Journal of alloys and compounds

JF - Journal of alloys and compounds

SN - 0925-8388

M1 - 170343

ER -