Development of an equiatomic octonary TiNbTaZrMoHfWCr super-high-entropy alloy for biomedical applications

A super-high-entropy alloy (SHEA) with ΔSmix ≥ 2.0R (where R is the gas constant) was designed to produce metallic materials with superior mechanical properties to conventional alloys. As an alternative to conventional quinary high-entropy alloys (HEAs), herein, octonary SHEAs for biomedical applica...

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Published in:Materials chemistry and physics 2024-04, Vol.316, p.129120, Article 129120
Main Authors: Matsuzaka, Tadaaki, Hyakubu, Akira, Kim, Yong Seong, Matsugaki, Aira, Nagase, Takeshi, Ishimoto, Takuya, Ozasa, Ryosuke, Kim, Hyoung Seop, Mizuguchi, Tomoji, Gokcekaya, Ozkan, Nakano, Takayoshi
Format: Article
Language:English
Subjects:
BioSHEAs
Octonary system
Solid-solution strengthening
Super-high-entropy alloys (SHEAs)
Supermulticomponent
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Summary:A super-high-entropy alloy (SHEA) with ΔSmix ≥ 2.0R (where R is the gas constant) was designed to produce metallic materials with superior mechanical properties to conventional alloys. As an alternative to conventional quinary high-entropy alloys (HEAs), herein, octonary SHEAs for biomedical applications (BioSHEAs) are proposed for the first time, and the TiNbTaZrMoHfWCr BioSHEA was fabricated. Arc-melted BioSHEA exhibited an extremely high yield strength of 1953 ± 84 MPa, which was approximately 550 MPa higher than that of the quinary TiNbTaZrMo BioHEA. This yield strength is considerably higher than that estimated by the rule of mixtures for pure metals, confirming the achievement of significant solid-solution strengthening induced by a supermulticomponent solid solution composed of elements with different atomic radii. Its biocompatibility was comparable to that of pure Ti and the quinary BioHEA, and superior to that of SUS316L. This study demonstrates the validity of a novel entropy-based guideline for increasing the mixing entropy to achieve metallic materials with ultrahigh strength. [Display omitted] •A super-high-entropy alloy (SHEA) with ΔSmix > 2.0R was designed.•Octonary TiNbTaZrMoHfWCr SHEA was developed for biomedical applications (BioSHEA).•Biocompatibility of the BioSHEA was comparable to that of pure Ti.•BioSHEA showed high yield strength (∼2000 MPa) due to solid-solution strengthening.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2024.129120