Crystallographic study of grain refinement of Al by Nb addition

Wang, Feng, Qiu, Dong, Liu, Zhi-Lin, Taylor, John A., Easton, Mark A. and Zhang, Ming-Xing (2014) Crystallographic study of grain refinement of Al by Nb addition. Journal of Applied Crystallography, 47 2: 770-779. doi:10.1107/S1600576714004476

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Author Wang, Feng
Qiu, Dong
Liu, Zhi-Lin
Taylor, John A.
Easton, Mark A.
Zhang, Ming-Xing
Title Crystallographic study of grain refinement of Al by Nb addition
Journal name Journal of Applied Crystallography   Check publisher's open access policy
ISSN 1600-5767
0021-8898
Publication date 2014-01-01
Sub-type Article (original research)
DOI 10.1107/S1600576714004476
Open Access Status File (Publisher version)
Volume 47
Issue 2
Start page 770
End page 779
Total pages 10
Place of publication Malden, MA, United States
Publisher Wiley-Blackwell
Language eng
Abstract The grain refinement of Al by the addition of a small amount of peritectic-forming solute, Nb, has been studied from the crystallographic point of view. Combining the observations of optical microscopy and scanning electron microscopy with the results of energy-dispersive X-ray spectroscopy and X-ray diffraction, it is confirmed that the particles observed at or near the grain centres of refined Al alloys are pro-peritectic Al3Nb particles. The crystallographic matching between the Al3Nb particles and Al grains has also been evaluated using an edge-to-edge matching model and further verified using electron backscatter diffraction and transmission electron microscopy. It is found that there are reproducible crystallographic orientation relationships between the Al3Nb particles and Al grains, and the experimental results are consistent with the predictions of the edge-to-edge matching model. This implies that the pro-peritectic Al3Nb particles are favourable nucleation sites for Al grains from the crystallographic point of view. Furthermore, the analysis of the size distribution of Al3Nb particles reveals that the Al3Nb particles at the grain centres have relatively large particle size, which also corroborates the high potency of Al3Nb according to the free growth model. It is therefore concluded that the significant grain refinement resulting from the addition of Nb is predominantly attributed to the in situ formed Al3Nb particles which promote grain refinement via enhanced heterogeneous nucleation.
Keyword Al alloys
Crystallography
Grain refinement
Peritectic
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 2015 Collection
 
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