Microstructure and mechanical properties of Ti/W and Ti-6A1-4V/W composites fabricated by powder-metallurgy

M. Frary, S. Abkowitz, S. M. Abkowitz, D. C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

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 languageEnglish (US)
Pages (from-to)103-112
Number of pages10
JournalMaterials Science and Engineering A
Volume344
Issue number1-2
DOIs
StatePublished - 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

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