Effect of Zr on super-elasticity and mechanical properties of Ti-24at% Nb-(0, 2, 4)at% Zr alloy subjected to aging treatment

Qiang Li, Mitsuo Niinomi, Masaaki Nakai, Zhenduo Cui, Shengli Zhu, Xianjin Yang

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

β-Type titanium alloys with composition of Ti-24. at% Nb-(0, 2, 4). at% Zr were prepared and subjected to aging treatment for different durations. The addition of Zr suppressed the formation and growth of isothermal ω phase during aging treatment, and therefore the investigated Ti-Nb-Zr alloys with different Zr content performed various deformation mechanisms, mechanical properties and super-elastic effects with the changes of aging time. The isothermal ω phase exerted inhibitory effects on twinning and stress-induced martensitic transformation. Desirable properties were obtained in Ti-Nb-Zr alloy by adding suitable Zr content and processing short time aging treatment. Ti-24. at% Nb-2. at% Zr alloy subjected to aging treatment at 573. K for 7.2. ks exhibited an ultimate tensile strength of 710. MPa, an elongation of 13%, a Young's modulus of 64. GPa, and a super-elastic recovery strain of 4.3%. Ti-24. at% Nb-4. at% Zr alloy subjected to aging treatment at 573. K for 1.8. ks, 3.6. ks, and 7.2. ks performed a low Young's modulus of 62. GPa and ultimate tensile strength around 600. MPa.

Original languageEnglish
Pages (from-to)197-206
Number of pages10
JournalMaterials Science and Engineering A
Volume536
DOIs
Publication statusPublished - 2012 Feb 28

Keywords

  • Aging
  • Mechanical property
  • Super-elasticity
  • Titanium alloy

ASJC Scopus subject areas

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

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