Unusual effect of oxygen on the mechanical behavior of a β-type titanium alloy developed for biomedical applications

Mitsuo Niinomi, Masaaki Nakai

研究成果: Conference contribution

5 被引用数 (Scopus)

抄録

Oxygen enhances the strength of titanium alloys in general; however, excess oxygen can make titanium alloys brittle. On the other hand, oxygen enhances the precipitation of the a phase and suppresses the formation of the ω phase. Thus, using the optimal amount of oxygen is important to improve the mechanical properties of titanium alloys. The role of oxygen in titanium alloys is still not well understood. The effect of oxygen on the mechanical behavior of a β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (referred to as TNTZ), which is used for biomedical applications, was investigated in this study. Oxygen was found to stabilize the ω phase in TNTZ. This behavior of oxygen is unusual considering the known behavior of oxygen in titanium alloys: oxygen is known to suppress the formation of the ω phase in titanium alloys. A small amount of oxygen increases the tensile strength but decreases the ductility of TNTZ. On the other hand, a large amount of oxygen, of around 0.7 mass%, increases both the tensile strength and the ductility of TNTZ. This phenomenon is unexpected.

本文言語English
ホスト出版物のタイトルTHERMEC 2011
出版社Trans Tech Publications Ltd
ページ135-142
ページ数8
ISBN(印刷版)9783037853030
DOI
出版ステータスPublished - 2012
イベント7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, Canada
継続期間: 2011 8月 12011 8月 5

出版物シリーズ

名前Materials Science Forum
706-709
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

Other

Other7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
国/地域Canada
CityQuebec City, QC
Period11/8/111/8/5

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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