Effect of tungsten additions on the mechanical properties of Ti-6Al-4V

Heeman Choe, Susan M. Abkowitz, Stanley Abkowitz, David C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

The alloy Ti-6Al-4V was modified by addition of 10 wt.% tungsten through powder metallurgy. Depending on the initial W powder size, different materials were formed after powder densification: (i) "alloys" for fine (0.7 and 2 μm) W powders which were almost completely dissolved in the Ti-6Al-4V matrix; (ii) "alloyed composites" for intermediate (12 and <45 μm) W powders which were partially dissolved; (iii) and "composites" for coarse (<250 μm) W powders which were nearly un-dissolved. In all cases, tungsten strengthens Ti-6Al-4V, but much more so when dissolved in the matrix than as a second phase. Ductility was not affected by W additions for the fully-dissolved alloys, but was reduced in the case of composites with W particles, which exhibited fracture or pull-out from the matrix. Flaw sensitivity was apparent from strain hardening being much lower in tension than in compression, and from a much reduced ductility exhibited by one specimen with residual porosity.

Original languageEnglish (US)
Pages (from-to)99-106
Number of pages8
JournalMaterials Science and Engineering A
Volume396
Issue number1-2
DOIs
StatePublished - Apr 15 2005

Keywords

  • Mechanical properties
  • Metal matrix composites
  • Powder-metallurgy
  • Titanium
  • Tungsten

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Effect of tungsten additions on the mechanical properties of Ti-6Al-4V'. Together they form a unique fingerprint.

  • Cite this