Abstract
Tungsten-reinforced Ti and Ti-6Al-4V composites were fabricated by powder metallurgical techniques from Ti, W and Al-V powders. The microstructure of the composites consists of partially dissolved tungsten particles within an α/β titanium matrix containing tungsten in solid-solution. Yield and ultimate tensile strengths increase linearly with tungsten content in the 0-15 wt.% W and decrease near-linearly with temperature in the range 25-540 °C. Ductility follows the opposite trend and is within technologically acceptable values, except for Ti/15W at 315 and 425 °C and Ti/10W at 540 8C which fractured near the ultimate stress value. The Ti-6Al-4V/10W composite shows the best combination of high strength and ductility at all temperatures. At ambient temperatures, Ti/10W exhibits a stress-strain curve very similar to Ti-6Al-4V (with a slight decrease in stiffness), while eliminating aluminum and vanadium alloy elements. Further improvements in mechanical properties of these non-equilibrium composites are likely to be achieved through optimized heat-treatments, which affect the matrix microstructure and the degree of dissolution of tungsten and thus the relative importance of matrix solid-solution strengthening and composite strengthening.
Original language | English (US) |
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Pages (from-to) | 103-112 |
Number of pages | 10 |
Journal | Materials Science and Engineering A |
Volume | 344 |
Issue number | 1-2 |
DOIs | |
State | Published - Mar 15 2003 |
Keywords
- Mechanical properties
- Powder-metallurgy
- Ti/W and Ti-6A1-4V/W composites
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering