Microstructure and mechanical properties of a high nitrogen titanium alloy

Tomohiro Ando, Koichi Nakashima, Toshihiro Tsuchiyma, Setsuo Takaki

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

High nitrogen titanium alloy with the chemical composition of Ti-4%Cr-0.6%N was produced by solution nitriding to nitrogen-free Ti-4%Cr alloy, and then its microstructure was controlled to have fine (α + β) dual phase structure by aging treatment to improve the ductility. As solution-nitrided specimen has a platelet hcp-martensitic structure (α′) and is characterized by hard but brittle nature that has been produced by solid solution of 0.6% of nitrogen. On the following aging treatment, fine β phase formed along the original plate boundaries, resulting in a fine (α + β) dual phase microstructure. X-ray and EELS analyses revealed that nitrogen is greatly concentrated in the tempered α′ phase. Although the hardness of as-quenched material gradually decreases during the aging treatment with increasing volume fraction of β, the hardness can be kept much higher than that of the aged Ti-4%Cr alloy without nitrogen. As a result of tensile testing, it was found that the aged Ti-4%Cr-0.6%N alloy has high tensile strength over 1 GPa with moderate ductility.

Original languageEnglish
Pages (from-to)228-234
Number of pages7
JournalMaterials Science and Engineering A
Volume486
Issue number1-2
DOIs
Publication statusPublished - Jul 15 2008

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titanium alloys
Titanium alloys
Nitrogen
mechanical properties
nitrogen
Mechanical properties
microstructure
Microstructure
Aging of materials
ductility
Ductility
hardness
Hardness
nitriding
Electron energy loss spectroscopy
Nitriding
Tensile testing
Phase structure
Platelets
platelets

All Science Journal Classification (ASJC) codes

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

Cite this

Microstructure and mechanical properties of a high nitrogen titanium alloy. / Ando, Tomohiro; Nakashima, Koichi; Tsuchiyma, Toshihiro; Takaki, Setsuo.

In: Materials Science and Engineering A, Vol. 486, No. 1-2, 15.07.2008, p. 228-234.

Research output: Contribution to journalArticle

Ando, Tomohiro ; Nakashima, Koichi ; Tsuchiyma, Toshihiro ; Takaki, Setsuo. / Microstructure and mechanical properties of a high nitrogen titanium alloy. In: Materials Science and Engineering A. 2008 ; Vol. 486, No. 1-2. pp. 228-234.
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