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

研究成果: ジャーナルへの寄稿学術誌査読

78 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)2693-2701
ページ数9
ジャーナルMaterials Science and Engineering: A
527
10-11
DOI
出版ステータス出版済み - 4月 25 2010
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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