Grain morphology of as-cast wrought aluminium alloys

Easton, Mark, Davidson, Cameron and St John, David (2011) Grain morphology of as-cast wrought aluminium alloys. Materials Transactions, 52 5: 842-847. doi:10.2320/matertrans.L-MZ201118

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Author Easton, Mark
Davidson, Cameron
St John, David
Title Grain morphology of as-cast wrought aluminium alloys
Journal name Materials Transactions   Check publisher's open access policy
ISSN 1345-9678
Publication date 2011-05-01
Year available 2011
Sub-type Article (original research)
DOI 10.2320/matertrans.L-MZ201118
Open Access Status Not Open Access
Volume 52
Issue 5
Start page 842
End page 847
Total pages 6
Place of publication Sendai, Japan
Publisher Nihon Kinzoku Gakkai
Language eng
Abstract Two of the most important microstructural features of alloys are the grain size and the secondary dendrite arm spacing (SDAS) and these two factors are shown to combine together to describe the grain morphology. Both grain refinement and the SDAS depend upon alloy composition through constitutional undercooling, but in different ways. It is shown that there is a ‘characteristic’ SDAS for each alloy at a particular cooling rate, and reducing the grain size causes the grain morphology to change from dendritic to cellular/rosette-like to globular or spherical. Increasing the cooling rate refines both the SDAS and the grain size, but reduces the SDAS more rapidly leading to finer, more dendritic grain structures. Particular ratios of grain size to SDAS are used to define each morphology and it is shown how these can assist with obtaining a required grain size and morphology through the use of solidification conditions and alloy chemistry.
Keyword Grain size
Dendrite arm spacing
Cooling rate
Constitutional undercooling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Special Issue on Aluminium Alloys 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2012 Collection
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