Temporal evolution of the nanostructure of Al(Sc,Zr) alloys: Part i - Chemical compositions of Al3(Sc1-xZrx) precipitates

Christian B. Fuller, Joanne L. Murray, David N. Seidman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

201 Scopus citations

Abstract

Atom-probe tomography (APT) and high-resolution transmission electron microscopy are used to study the chemical composition and nanostructural temporal evolution of Al3(Sc1-xZrx) precipitates in an Al-0.09 Sc-0.047 Zr at.% alloy aged at 300 °C. Concentration profiles, via APT, reveal that Sc and Zr partition to Al 3(Sc1-xZrx) precipitates and Zr segregates concomitantly to the α-Al/Al3(Sc1-xZrx) interface. The Zr concentration in the precipitates increases with increasing aging time, reaching a maximum value of 1.5 at.% at 576 h. The relative Gibbsian interfacial excess (ΓZrAl-Sc) of Zr, with respect to Al and Sc, reaches a maximum value of 1.24 ± 0.62 atoms nm-2 after 2412 h. The temporal evolution of Al3(Sc1-xZrx) precipitates is determined by measuring the time dependence of the depletion of the matrix supersaturation of Sc and Zr. The time dependency of the supersaturation of Zr does not follow the asymptotic t-1/3 law while that of Sc does, indicating that a quasi-stationary state is not achieved for both Sc and Zr.

Original languageEnglish (US)
Pages (from-to)5401-5413
Number of pages13
JournalActa Materialia
Volume53
Issue number20
DOIs
StatePublished - Dec 2005

Keywords

  • Al-Sc-Zr alloys
  • High-resolution electron microscopy
  • Microstructure
  • Precipitation
  • Three-dimensional atom-probe microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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