Design and Development of Ti–Zr–Nb–Ta–Ag High Entropy Alloy for Bioimplant Applications

Mohamed Abdrabou Hussein*, Mohammed Abdul Azeem, Arumugam Madhan Kumar, Nestor Ankah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A new non-equiatomic 35Ti–35Zr–20Nb–5Ta–5Ag at% high entropy alloy (HEA) is designed by combining the HEA concept with the properties required for bioimplants. Mechanical alloying is used to synthesize the HEA, which is then compacted at 550 and 700 MPa and sintered at 1300 °C. The phases, microstructure, and mechanical properties are investigated, and in vitro corrosion properties are studied in a simulated body fluid. After 20 h of mechanical alloying, a single body-centered cubic (BCC) phase with a nanocrystalline size of 3.6 nm was formed. After sintering, the microstructure is composed of dual-phase BCC structures: the major BCC 1 phase, the grain boundary BCC 2 phase, and the ultra-fine equiaxed phase. The results of the micro-indentation test indicate that the elastic modulus of the HEA is 84.4 ± 8.7 and 113.2 ± 13.36 GPa, and its Vickers microhardness is 3.47 ± 0.1 and 5.35 ± 0.2 GPa when it was compacted at 550 and 700 MPa respectively. The corrosion resistance tests reveal that HEA compacted at 700 MPa has higher corrosion resistance than commercial Ti6Al4V alloy. The developed Ti–Zr–Nb–Ta–Ag HEA has improved corrosion resistance and a lower elastic modulus, making it a potential candidate for bioimplant applications.

Original languageEnglish
JournalAdvanced Engineering Materials
DOIs
StateAccepted/In press - 2024

Bibliographical note

Publisher Copyright:
© 2024 Wiley-VCH GmbH.

Keywords

  • biomaterials
  • corrosion
  • high entropy alloy
  • mechanical alloying
  • powder metallurgy

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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