Enhanced yielding strength of near-α Ti-Al-Zr-Sn high temperature alloys

M. Jayaprakash, D. H. Ping, Y. Yamabe-Mitarai

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The effect of Si3N4 addition on the mechanical properties and microstructure of Ti-Al-Zr-Sn based near-α Ti alloys has been systematically investigated at both room temperature and high temperature (650°C). Minor Mo and Ta (β stabilizing elements) together with Si3N4 addition have significantly improved the compressive yielding strength at both room temperature and 650°C. The strengthening effect was mainly due to the precipitation of TiN, α2-Ti3Al and the retained β phase. High compressive yielding strength together with pronounced ductility can be obtained by only adding minor Si3N4 into Ti-Al-Zr-Sn alloys. The enhanced ductility is probably due to the depression of the brittle α2 intermetallic phase, which did not precipitate out even after long time ageing (750°C for 500h).

Original languageEnglish
Pages (from-to)131-139
Number of pages9
JournalMaterials Science and Engineering A
Volume625
DOIs
Publication statusPublished - 2015 Feb 1

Keywords

  • Compression test
  • Microstructure
  • Scanning electron microscopy (SEM)
  • Ti-alloy
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

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

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