Effects of Fe addition on tensile deformation mode and crevice corrosion resistance in Ti-15Mo alloy

X. H. Min, S. Emura, N. Sekido, T. Nishimura, K. Tsuchiya, K. Tsuzaki

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The tensile deformation mode at ambient temperature and the crevice corrosion resistance at a high temperature of 373 K were investigated in Ti-15Mo and Ti-15Mo-1Fe (mass%) alloys. The β phase stability increased, and the formation of an athermal ω phase was suppressed by the Fe addition. EBSD and TEM observations showed that the deformation mode in the Ti-15Mo alloy changed from a {3 3 2}〈1 1 3〉 twinning to a slip by the Fe addition, which coincided with the predictions from the electron/atom (e/a) ratio and the Mo equivalency. EPMA examinations indicated that the existence of twins in a few regions in the Ti-15Mo-1Fe alloy was caused by the solidification segregation of Mo and Fe atoms. The yield strength of the Ti-15Mo-1Fe alloy of 837 MPa was much higher than that of the Ti-15Mo alloy of 439 MPa due to the change in the deformation mode. The Ti-15Mo-1Fe alloy maintained an extremely high crevice corrosion resistance in a 10% NaCl water solution with a pH value of 0.5 at 373 K since there was no significant decrease in the average value of the bond order (Bo). A good combination of tensile properties, crevice corrosion resistance and cost is thought to be obtainable through further optimization of the chemical compositions by the e/a ratio, the Mo equivalency and the Bo.

Original languageEnglish
Pages (from-to)2693-2701
Number of pages9
JournalMaterials Science and Engineering A
Volume527
Issue number10-11
DOIs
Publication statusPublished - 2010 Apr 25
Externally publishedYes

Keywords

  • Beta titanium alloys
  • Crevice corrosion
  • Deformation mode
  • Phase stability
  • Solidification segregation

ASJC Scopus subject areas

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

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