Abnormal Deformation Behavior of Oxygen-Modified β-Type Ti-29Nb-13Ta-4.6Zr Alloys for Biomedical Applications

Huihong Liu, Mitsuo Niinomi, Masaaki Nakai, Xin Cong, Ken Cho, Carl J. Boehlert, Vahid Khademi

Research output: Contribution to journalArticle

  • 3 Citations

Abstract

Oxygen was added to the biomedical β-type Ti-29Nb-13Ta-4.6Zr alloy (TNTZ, mass pct) in order to improve its strength, while keeping its Young’s modulus low. Conventionally, with an increase in the oxygen content, an alloy’s tensile strength increases, while its tensile elongation-to-failure decreases. However, an abnormal deformation behavior has been reported in the case of oxygen-modified TNTZ alloys in that their strength increases monotonically while their elongation-to-failure initially decreases and then increases with the increase in the oxygen content. In this study, this abnormal tensile deformation behavior of oxygen-modified TNTZ alloys was investigated systematically. A series of TNTZ-(0.1, 0.3, and 0.7 mass pct)O alloy samples was prepared, treated thermomechanically, and finally solution treated; these samples are denoted as 0.1ST, 0.3ST, and 0.7ST, respectively. The main tensile deformation mechanisms in 0.1ST are a deformation-induced α″-martensitic transformation and {332}〈113〉 mechanical twinning. The large elongation-to-failure of 0.1ST is attributable to multiple deformation mechanisms, including the deformation-induced martensitic transformation and mechanical twinning as well as dislocation glide. In both 0.3ST and 0.7ST, dislocation glide is the predominant deformation mode. 0.7ST shows more homogeneous and extensive dislocation glide along with multiple slip systems and a higher frequency of cross slip. As a result, it exhibits a higher work-hardening rate and greater resistance to local stress concentration, both of which contribute to its elongation-to-failure being greater than that of 0.3ST.

LanguageEnglish (US)
Pages139-149
Number of pages11
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume48
Issue number1
DOIs
StatePublished - Jan 1 2017

Profile

elongation
Oxygen
mechanical twinning
oxygen
tensile deformation
Elongation
martensitic transformation
slip
Twinning
Martensitic transformations
work hardening
stress concentration
twinning
tensile strength
modulus of elasticity
Ti-29Nb-13Ta-4.6Zr alloy
Dislocations (crystals)
Strain hardening
Stress concentration
Tensile strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Abnormal Deformation Behavior of Oxygen-Modified β-Type Ti-29Nb-13Ta-4.6Zr Alloys for Biomedical Applications. / Liu, Huihong; Niinomi, Mitsuo; Nakai, Masaaki; Cong, Xin; Cho, Ken; Boehlert, Carl J.; Khademi, Vahid.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 48, No. 1, 01.01.2017, p. 139-149.

Research output: Contribution to journalArticle

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