An analysis of the relationship between grain size, solute content, and the potency and number density of nucleant particles

Easton, M. and St John, D. (2005) An analysis of the relationship between grain size, solute content, and the potency and number density of nucleant particles. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 36 7: 1911-1920.


Author Easton, M.
St John, D.
Title An analysis of the relationship between grain size, solute content, and the potency and number density of nucleant particles
Journal name Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2005
Sub-type Article (original research)
DOI 10.1007/s11661-005-0054-y
Volume 36
Issue 7
Start page 1911
End page 1920
Total pages 10
Editor David E. Laughlin
Place of publication USA
Publisher A S M International
Collection year 2005
Language eng
Subject C1
291400 Materials Engineering
671004 Castings
Abstract To be able to determine the grain size obtained from the addition of a grain refining master alloy, the relationship between grain size (d), solute content (defined by the growth restriction factor Q), and the potency and number density of nucleant particles needs to be understood. A study was undertaken on aluminium alloys where additions of TiB2 and Ti were made to eight wrought aluminum alloys covering a range of alloying elements and compositions. It was found from analysis of the data that d = a/(3)root pct TiB2 + b/Q. From consideration of the experimental data and from further analysis of previously published data, it is shown that the coefficients a and b relate to characteristics of the nucleant particles added by a grain refiner. The term a is related to the maximum density of active TiB2 nucleant particles within the melt, while b is related to their potency. By using the analysis methodology presented in this article, the performance characteristics of different master alloys were defined and the effects of Zr and Si on the poisoning of grain refinement were illustrated.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Al-ti-b
Aluminum-alloys
Master Alloys
Refinement
Mechanism
Solidification
Constitution
Additions
Titanium
Melts
Q-Index Code C1

 
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