Abstract
Composition dependence of Young's modulus in β Ti-Nb and Ti-V binary alloys was investigated at room temperature to obtain fundamental information for development of low Young's modulus Ti alloys. With increasing Nb or V content, Young's modulus of quenched alloys decreases, exhibits a minimum value and then increases in good agreement with that in references. In a region where the modulus decreases, athermal ω particles are observed by transmission electron microscopy (TEM) more distinctly at lower alloying contents. Very weak athermal ω reflections are seen in TEM diffraction patterns at the composition corresponding to the minimum. When an alloy with the composition at the minimum is aged at 300°C, it is hardened by isothermal ω precipitation, thereby increasing Young's modulus. Compression tests of β Ti-Nb and Ti-V binary alloy single crystals revealed that {332}〈113〉 twinning occurs as a plastic deformation mode in the composition region where the modulus decreases, and crystallographic slip occurs with further increasing Nb or V content. It is concluded that ω particles strongly influence Young's modulus, hardness and plastic deformation mode in β Ti-Nb and Ti-V binary alloys, and the minimum in Young's modulus is associated with athermal ω formation. Ternary Sn addition further decreases Young's modulus, which is attributable to suppression of ω formation.
Original language | English |
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Pages (from-to) | 3103-3108 |
Number of pages | 6 |
Journal | Materials Science Forum |
Volume | 426-432 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2003 |
Event | Thermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain Duration: 2003 Jul 7 → 2003 Jul 11 |
Keywords
- Beta titanium alloy
- Omega phase
- Slip
- Twinning
- Young's modulus
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering