Effect of oxide particles formed through addition of rare-earth metal on mechanical properties of biomedical β-type titanium alloy

Junko Hieda, Mitsuo Niinomi, Masaaki Nakai, Ken Cho, Shigeki Nagai

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In order to improve the mechanical properties of Ti-29Nb-13Ta-4.6Zr (TNTZ) alloy without increasing Young's modulus for application in bone prostheses, dispersion strengthening of TNTZ using yttrium oxide (Y2O 3) particles was studied. The formation of well-dispersed Y 2O3 particles inside grains of Y-added TNTZ is achieved through the reaction of added Y with the oxygen contained in TNTZ. The size and its standard deviation of obtained Y2O3 particles increased at Y concentrations of 0.2 and 0.5 mass%. The addition of Y led to a decrease in the grain size in Y-added TNTZ. Low Young's modulus was retained in the Y-added TNTZ subjected to cold rolling. The tensile strength and 0.2% proof stress slightly increased in Y-added TNTZ with Y concentrations below 0.1 mass%, whereas they decreased significantly in Y-added TNTZ with Y concentrations of 0.2 and 0.5 mass%. Large Y2O3 particles that formed in Y-added TNTZ with Y concentrations of 0.2 and 0.5 mass% worked as sources for the formation of voids during fracture, which resulted in a decrease in the tensile strength and 0.2% proof stress. Elongation tended to decrease in the Y-added TNTZ as compared to that of TNTZ without any Y addition. As a result, it is found that Y-added TNTZ with improved mechanical properties was obtained at a Y concentration of 0.05 mass% in this experiment. The fatigue strength of Y-added TNTZ was also improved at the Y concentration of 0.05 mass%.

Original languageEnglish
Pages (from-to)1361-1367
Number of pages7
JournalMaterials Transactions
Volume54
Issue number8
DOIs
Publication statusPublished - 2013

Keywords

  • Dispersion strengthening
  • Mechanical properties
  • Oxide particles
  • Rare-earth metal
  • β-type titanium alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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