Improvement in fatigue strength while keeping low Young's modulus of a β-type titanium alloy through yttrium oxide dispersion

Xiu Song, Mitsuo Niinomi, Masaaki Nakai, Harumi Tsutsumi, Lei Wang

研究成果: Article査読

23 被引用数 (Scopus)

抄録

Improvement in fatigue strength in spite of maintaining low Young's modulus was achieved in Ti-29Nb-13Ta-4.6Zr (TNTZ) by hard-particles dispersion. A certain amount of Y2O3 additions was added into TNTZ. TNTZ with 0.05-1.00mass%Y consists of a β-phase with a small amount of Y 2O3. Young's moduli of TNTZ with 0.05-1.00mass%Y are maintained low, and are almost similar to that of TNTZ without Y 2O3. The tensile strength of TNTZ with 0.05-1.00mass%Y is slightly improved and the elongation does not deteriorate by Y2O 3 additions. However, the 0.2% proof stress decreases with the increase in Y concentration. Although tensile properties are not changed drastically, the fatigue strength is significantly improved by Y 2O3 additions. The dispersion of Y2O 3 particle increases the resistance to fatigue initiation. However, Y2O3 with too large diameter at the surface of the specimen works harmfully as the fatigue initiation site. The Y2O 3 diameter and volume fraction increase with the increase in Y concentration. As a result, the fatigue limit of the alloys with 0.05-1.00mass%Y firstly increases and then decreases with the increase in Y concentration. TNTZ with 0.1mass% Y exhibits the best combination of higher fatigue strength and low Young's modulus.

本文言語English
ページ(範囲)542-549
ページ数8
ジャーナルMaterials Science and Engineering C
32
3
DOI
出版ステータスPublished - 2012 4 1

ASJC Scopus subject areas

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

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