Scandium (Sc) behavior in high temperature Ti alloys

D. H. Ping, S. Q. Wu, Y. Yamabe-Mitarai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The microstructural evolution and elevated temperature tensile properties of Ti-6.6Al-5.2Sn-1.8Zr-(0∼3.8)Sc (wt%) alloys have been investigated. The Sc-added alloys showed improved yield strength at 650°C and 750°C and with the elongation above 10%. Minor addition of Sc was found to significantly reduce the as-cast grain size. Higher amount of Sc additions resulted in the formation of high density of Sc-oxide, which causes the high strength at elevated temperatures and the reduction of ductility. High density of α2-Ti3Al fine precipitates with an average size of about 20 nm were observed inside equiaxed primary α (αp) grains in the Sc-free or minor Sc added alloys. However, precipitation free zone (PFZ) also formed in those alloys, where grain boundaries are free from any precipitates. Higher Sc addition was found to hinder the formation of PFZ and α2-precipitates.

Original languageEnglish
Title of host publicationPowder Metallurgy of Titanium
Subtitle of host publicationPowder Processing, Consolidation and Metallurgy of Titanium
PublisherTrans Tech Publications Ltd
Pages57-62
Number of pages6
ISBN (Print)9783037854686
DOIs
Publication statusPublished - 2012
Event1st International Conference on Powder Processing, Consolidation and Metallurgy of Titanium - Brisbane, QLD, Australia
Duration: 2011 Dec 42011 Dec 7

Publication series

NameKey Engineering Materials
Volume520
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Other

Other1st International Conference on Powder Processing, Consolidation and Metallurgy of Titanium
CountryAustralia
CityBrisbane, QLD
Period11/12/411/12/7

Keywords

  • Mechanical properties
  • Microstructure
  • Near-α titanium alloys
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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