Effect of aging treatment on mechanical properties of Ti-29Nb-13Ta-4.6Zr alloy for biomedical applications

Toshikazu Akahori, Mitsuo Niinomi, Atsushi Noda, Hiroyuki Toda, Hisao Hukui, Michiharu Ogawa

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

The relationships between mechanical properties and microstructure of Ti-29Nb-13Ta-4.6Zr in under aged, peak aged and over aged conditions at various aging temperatures were investigated. The maximum Vickers hardness values of Ti-29Nb-13Ta-4.6Zr aged at 573 K, 673 K and 723 K are obtained at aging times of around 2419.2 ks, 3024 ks and 1209.6 ks, respectively. ω phase precipitates in β phase of Ti-29Nb-13Ta-4.6Zr at relatively low aging temperature, 573 K, while a phase precipitates in β phase of Ti-29Nb-13Ta-4.6Zr at relatively higher aging temperature, 723 K. At an aging temperature of 673 K that lies between aging temperatures of 573 K and 723 K, ω phase precipitates at the early stage of aging, but a phase precipitates at relatively longer aging time. The precipitation site of a phase changes from intragrain to grain boundary at around peak aging time when Ti-29Nb-13Ta-4.6Zr is aged at 673 K and 723 K. The tensile strength of Ti-29Nb-13Ta-4.6Zr aged at 573 K, 673 K and 723 K increases up to a peak aging time with increasing aging time, but under over aging conditions, the tensile strength decreases. While the elongation decreases with increasing aging time at every aging temperature. The fatigue strength of Ti-29Nb-13Ta-4.6Zr increases greater when α phase precipitates than when ω phase precipitates. The fatigue strength of Ti-29Nb-13Ta-4.6Zr decreases a little due to the coarsening of α phase precipitated in β grain.

本文言語英語
ページ(範囲)295-303
ページ数9
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
70
4
DOI
出版ステータス出版済み - 4 1 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学

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