Microstructural evolution and its influence on the mechanical properties of a thermomechanically processed beta Ti-32Zr-30Nb alloy


Ozan S., Li Y., Lin J., Zhang Y., Jiang H., Wen C.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol.719, pp.112-123, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 719
  • Publication Date: 2018
  • Doi Number: 10.1016/j.msea.2018.02.034
  • Journal Name: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.112-123
  • Keywords: Cold rolling, Deformation mechanism, Mechanical properties, Recrystallization annealing, Ti-Zr-Nb, CHANGEABLE YOUNGS MODULUS, SPINAL FIXATION APPLICATIONS, TI-CR ALLOYS, TITANIUM-ALLOYS, BIOMEDICAL APPLICATIONS, TENSILE PROPERTIES, PHASE-STABILITY, DEFORMATION MECHANISMS, TINBSN ALLOYS, HIGH-STRENGTH
  • Yozgat Bozok University Affiliated: Yes

Abstract

In this study, microstructural evolution and its influence on the mechanical properties of a newly developed titanium-zirconium-niobium (TZN) alloy after cold rolling and recrystallization annealing have been investigated. With an increase in the cold rolling reduction rate (CRRR) of the Ti-32Zr-30Nb TZN alloy, a change in the plastic deformation mechanisms has been observed. Deformation-induced alpha" and kink bands were observed in the TZN alloy after cold rolling at 20% and 56% CRRR; however, with a further increase in CRRR, while the deformation mechanisms including kink bands, {332} < 113 > beta mechanical twinning and shear bands were increased, the formation of deformation-induced alpha" was suppressed. The Young's modulus of the TZN alloy specimen after cold rolling at 86% CRRR was found to be higher than those of the specimens after cold rolling at 20%, 56% and 76% CRRR, due to the reverse transformation of the deformation-induced martensite alpha" into beta. The TZN alloy is evaluated as a promising candidate material for orthopaedic implant applications by virtue of its unique combination of values for Young's modulus, tensile strength, elongation at rupture and elastic admissible strain, which were measured in the ranges of 57-69 GPa, 692-961 MPa, 4-10% and 1.11-1.31%, respectively, after various thermomechanical treatments.