Relationship between microstructures and mechanical properties in Ti4.5Al2Mo1.6V0.5Fe0.3Si0.03C for next-generation aircraft applications

Toshikazu Akahori, Mitsuo Niinomi, Masaaki Nakai, Harumi Tsutsumi, Shiro Aki, Yoshio Itsumi, Shogo Murakami, Hideto Oyama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effects of various heat treatments on the microstructure and mechanical properties of an (α + β)-type titanium alloy, Ti4.5Al2Mo1.6V0.5Fe0. 3Si0.03C (KS Ti-9), were investigated systematically for possible use in next-generation aircraft applications. The as-received KS Ti-9 shows strong anisotropy of mechanical strength derived from the intense texture (T-texture) of the primary α phase. This anisotropy continues to be observed in KS Ti-9 annealed at a temperature below β transus followed by air cooling, but the anisotropy drastically decreases in KS Ti-9 when subjected to a duplex heat treatment, that is, when the as-received material of KS Ti-9 is sequentially heated to a temperature slightly below β transus followed by water quenching and then annealed followed by air cooling. It is considered that the reduction in the anisotropy in KS Ti-9 subjected to this duplex heat treatment is associated with the difference in the orientation of the precipitated acicular α phase.

Original languageEnglish
Pages (from-to)783-790
Number of pages8
JournalMaterials Transactions
Volume54
Issue number5
DOIs
Publication statusPublished - 2013 May 20

Keywords

  • (α + β)-type titanium alloy
  • Anisotropy
  • Tensile properties
  • Texture

ASJC Scopus subject areas

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

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