Mechanical behaviour of Ti-Nb-Hf alloys

R. Yang, K.M. Rahman, A.N. Rakhymberdiyev, D. Dye, V.A. Vorontsov

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Ti-(24,26)Nb-(2,4)Hf at.% alloys were designed by assuming that hafnium has a similar effect to zirconium in the Ti-Nb-Zr system. Alloy specimens were produced using vacuum arc melting and subsequently hot-rolled. Uniaxial tensile testing was then performed both at ambient temperature and in liquid nitrogen at −196 °C. While the alloys showed no obvious superelastic behaviour, they exhibited pronounced strain hardening and could achieve high elongations before failure (>30% engineering strain). Post-mortem examination revealed that the mechanism of strain hardening was extensive {332} and/or {211} deformation twinning. Twinning was found to be more prevalent in alloys with 2at.% Hf compared to those with 4at.%. The cryogenic temperature deformation also promoted deformation twinning when compared to ambient temperature results. As is the case with other metastable β-Ti alloys, maintaining control over the precipitation of ω phases was found to be crucial for attaining desirable mechanical behaviour. Further, microstructural engineering and alloying may be used to develop strong, lightweight alloys based on the Ti-Nb-Hf system with beneficial strain hardening characteristics for energy absorption and biomedical applications.
LanguageEnglish
Number of pages30
JournalMaterials Science and Engineering: A
Early online date12 Oct 2018
DOIs
Publication statusE-pub ahead of print - 12 Oct 2018

Fingerprint

strain hardening
Twinning
twinning
Strain hardening
ambient temperature
Hafnium
vacuum melting
engineering
arc melting
hafnium
Tensile testing
energy absorption
Energy absorption
Liquid nitrogen
cryogenic temperature
Alloying
Zirconium
liquid nitrogen
Cryogenics
Temperature

Keywords

  • titanium alloys
  • mechanical behaviour
  • deformation twinning
  • martensitic transformation
  • cryogenic testing

Cite this

Yang, R. ; Rahman, K.M. ; Rakhymberdiyev, A.N. ; Dye, D. ; Vorontsov, V.A. / Mechanical behaviour of Ti-Nb-Hf alloys. In: Materials Science and Engineering: A. 2018.
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Mechanical behaviour of Ti-Nb-Hf alloys. / Yang, R.; Rahman, K.M.; Rakhymberdiyev, A.N.; Dye, D.; Vorontsov, V.A.

In: Materials Science and Engineering: A, 12.10.2018.

Research output: Contribution to journalArticle

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AU - Rahman, K.M.

AU - Rakhymberdiyev, A.N.

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