Improvement of strength-ductility tradeoff in β titanium alloy through pre-strain induced twins combined with brittle ω phase

Xiaohua Min, Satoshi Emura, Ling Zhang, Kaneaki Tsuzaki, Koichi Tsuchiya

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This paper provided a novel approach for improving the strength-ductility tradeoff in β titanium alloy through a combination of mechanical {332}<113> twins with brittle isothermal ω phase. Effects of pre-strain induced twins and subsequent precipitated ω phase on deformation microstructures, and tensile properties were investigated in a β-type Ti-15Mo alloy (mass%). Mechanical twins increased with increasing pre-strain from 1% to 9%, while formation of isothermal ω phase at 523-673. K for 3.6. ks was not significantly affected by the pre-strain induced twins. Yield strength and uniform elongation characteristics depended strongly on degree of pre-strain and aging temperature. An effective combination of 1-4% pre-strain and subsequent aging at 523-573. K markedly enhanced the uniform elongation in range of 8-15% at the yield strength level of 800-1000. MPa. The enhanced uniform elongation was mainly attributable to further twinning activation during deformation in conjunction with pre-strain induced twins.

Original languageEnglish
Pages (from-to)279-287
Number of pages9
JournalMaterials Science and Engineering A
Volume646
DOIs
Publication statusPublished - Oct 14 2015

Fingerprint

titanium alloys
tradeoffs
ductility
Titanium alloys
elongation
Ductility
yield strength
Elongation
precipitation hardening
tensile properties
twinning
Yield stress
Aging of materials
activation
microstructure
Twinning
Tensile properties
Chemical activation
Microstructure
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Improvement of strength-ductility tradeoff in β titanium alloy through pre-strain induced twins combined with brittle ω phase. / Min, Xiaohua; Emura, Satoshi; Zhang, Ling; Tsuzaki, Kaneaki; Tsuchiya, Koichi.

In: Materials Science and Engineering A, Vol. 646, 14.10.2015, p. 279-287.

Research output: Contribution to journalArticle

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