Phase transformation and its effect on mechanical characteristics in warm-deformed Ti-29Nb-13Ta-4.6Zr alloy

Taekyung Lee, Masaaki Nakai, Mitsuo Niinomi, Chan Hee Park, Chong Soo Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Ti-29Nb-13Ta-4.6Zr (TNTZ) alloy has been extensively studied as it is promising for use in biomedical applications. Despite its potential, the effects of warm plastic deformation on the alloy have not yet been revealed. This study investigated the differences in phase constitution of two warm-deformed TNTZ alloys and revealed relevant mechanisms with particular attention to martensitic transformation. The influence of phase constituents on mechanical characteristics was discussed as well. The TNTZ alloy deformed at 823 K possessed α, β, and ω phases as well as α″ martensite, and demonstrated a low Young’s modulus and double-yielding phenomenon. In contrast, the alloy deformed at 723 K had no martensite but more ω phase, leading to increased strength, hardness, and Young’s modulus. The absence of α″ martensite in the alloy deformed at 723 K was interpreted in light of β-stability of the parent phase and reduced Ms temperature.

Original languageEnglish
Pages (from-to)202-207
Number of pages6
JournalMetals and Materials International
Volume21
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • biomaterials
  • mechanical properties
  • phase transformation
  • thermomechanical processing
  • titanium alloy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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