Deformation-induced x phase in modified Ti-29Nb-13Ta-4.6Zr alloy by Cr addition

Qiang Li, Mitsuo Niinomi, Junko Hieda, Masaaki Nakai, Ken Cho

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


For spinal-fixation applications, implants should have a high Young's modulus to reduce springback during operations, though a low Young's modulus is required to prevent stress shielding for patients after surgeries. In the present study, Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) with a low Young's modulus was modified by adding Cr to obtain a higher deformation-induced Young's modulus in order to satisfy these contradictory requirements. Two newly designed alloys, TNTZ-8Ti-2Cr and TNTZ-16Ti-4Cr, possess more stable b phases than TNTZ. These alloys consist of single b phases and exhibit relatively low Young's moduli of <65 GPa after solution treatment. However, after cold rolling, they exhibit higher Young's moduli owing to a deformation-induced x-phase transformation. These modified TNTZ alloys show significantly less springback than the original TNTZ alloy based on tensile and bending loading-unloading tests. Thus, the Cr-added TNTZ alloys are beneficial for spinal-fixation applications.

Original languageEnglish
Pages (from-to)8027-8035
Number of pages9
JournalActa Biomaterialia
Issue number8
Publication statusPublished - 2013 Aug


  • Biomaterial
  • Deformation-induced x phase
  • Springback
  • Titanium alloy
  • Young's modulus

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Biochemistry
  • Biomedical Engineering
  • Molecular Biology


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