Abstract
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.
Original language | English |
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Pages (from-to) | 542-549 |
Number of pages | 8 |
Journal | Materials Science and Engineering C |
Volume | 32 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2012 Apr 1 |
Keywords
- Biomaterial
- Fatigue properties
- Rare earth oxide
- Young's modulus
- β-type titanium alloy
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering