The grain refinement mechanism of cast aluminium by zirconium

Wang, Feng, Qiu, Dong, Liu, Zhi-Lin, Taylor, John A., Easton, Mark A. and Zhang, Ming-Xing (2013) The grain refinement mechanism of cast aluminium by zirconium. Acta Materialia, 61 15: 5636-5645. doi:10.1016/j.actamat.2013.05.044


Author Wang, Feng
Qiu, Dong
Liu, Zhi-Lin
Taylor, John A.
Easton, Mark A.
Zhang, Ming-Xing
Title The grain refinement mechanism of cast aluminium by zirconium
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2013-09
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.actamat.2013.05.044
Volume 61
Issue 15
Start page 5636
End page 5645
Total pages 10
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Collection year 2014
Language eng
Formatted abstract
The mechanism underlying the grain refinement of cast aluminium by zirconium has been studied through examination of a range of Al alloys with increasing Zr contents. Pro-peritectic Al3Zr particles are reproducibly identified at or near the grain centres in grain-refined alloy samples based on the observations of optical microscopy, scanning electron microscopy and X-ray diffraction. From the crystallographic study using the edge-to-edge matching model, electron backscatter diffraction and transmission electron microscopy, it is substantiated that the Al3Zr particles are highly potent nucleants for Al. In addition, the effects of Al3Zr particle size and distribution on grain refinement has also been investigated. It has been found that the active Al3Zr particles are bigger than previously reported other types of active particles, such as TiB2 for heterogeneous nucleation in Al alloys. Considering the low growth restriction effect of Zr in Al (the maximum Q-value of Zr in Al is 1.0 K), it is suggested that the significant grain refinement of Al resulting from the addition of Zr can be mainly attributed to the heterogeneous nucleation facilitated by the in situ formed Al3Zr particles.
Keyword Cast aluminium
Grain refinement
Peritectic
Edge-to-edge matching model
Al Based Alloys
Mg-Al
Magnesium Alloys
Heterogeneous Nucleation
Widmanstatten Cementite
Si Alloys
Part II
Crystallography
Inoculation
Particles
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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