Dynamic recrystallisation and superplasticity in pure aluminium with zirconium addition

S. Katsas, R. Dashwood, R. Grimes, M. Jackson, G. Todd, H. Henein

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

When commercial superplastic aluminium alloys were first under development it was concluded that to be successful the alloy should contain both a solid solution addition and a dispersion of fine, thermally stable dispersoids. In contrast to early beliefs, the present work demonstrates that a simple Al–1 wt.%Zr alloy can exhibit good superplastic performance despite the absence of a solid solution element. The starting material was in the form of ∼1 mm diameter particles produce via impulse atomisation that conferred a solidification rate ∼103 K s−1. After extrusion consolidation, heat treatment to produce a fine distribution of metastable Al3Zr precipitates, and rolling, the resulting sheet exhibited superplastic ductilities in excess of 500% at a strain rate of 10−1 s−1. An EBSD study of the deformation behaviour demonstrated substantial grain refinement resulting from dynamic recrystallisation.
Original languageEnglish
Pages (from-to)291-297
Number of pages7
JournalMaterials Science and Engineering A
Volume444
Issue number1-2
Early online date16 Oct 2006
DOIs
Publication statusPublished - 25 Jan 2007

Keywords

  • Superplasticity
  • Aluminium alloy
  • Dynamic recrystallisation
  • Rapid solidification
  • Zirconium

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