Settling behaviour of different grain refiners in aluminium

Schaffer, Paul L. and Dahle, Arne K. (2005) Settling behaviour of different grain refiners in aluminium. Materials Science and Engineering A, 413-414 373-378. doi:10.1016/j.msea.2005.08.202


Author Schaffer, Paul L.
Dahle, Arne K.
Title Settling behaviour of different grain refiners in aluminium
Journal name Materials Science and Engineering A   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2005-12-15
Sub-type Article (original research)
DOI 10.1016/j.msea.2005.08.202
Volume 413-414
Start page 373
End page 378
Total pages 6
Place of publication Lausanne, Switzerland
Publisher Elsevier
Language eng
Formatted abstract
Grain refiner is added to the melt in order to introduce particles which are effective nucleant substrates for the primary aluminium phase. The most widely used grain refiners are based on the Al-Ti-B system. Depending on the composition of the master alloy, TiB2, (AI,Ti)B2 and Al3Ti particles can be introduced. Ideally, the nucleant particles should be homogeneously distributed throughout the melt to ensure a large number of nucleation events and a uniform microstructure. However, a difference in density exists between the grain refining particles (TiB2 density similar to 4.5 g/cm3)and the melt (pure aluminium density similar to 2.3 g/cm(3)) and therefore the particles sink, making it difficult to maintain a homogeneous distribution of grain refining particles. Particle characteristics (size and density) strongly influence the settling behaviour when the master alloy is diluted in the melt. This paper reports on the behaviour of three grain refiner master alloys containing particles of different size distribution and composition. In all three cases, it was found that the particles settled quite quickly and agglomeration of the refining particles also played an important role in the rate of settling, (c) 2005 Elsevier B.V. All rights reserved.
Keyword Aluminium
Grain refinement
Grain refiners
Fade
Settling
Al
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes International Conference on Advances in Solidification Processes

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
 
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Created: Tue, 14 Aug 2007, 01:48:27 EST