The Influence of the Effect of Solute on the Thermodynamic Driving Force on Grain Refinement of Al Alloys

Wang, Feng, Liu, Zhi-Lin, Qiu, Dong, Taylor, John A., Easton, Mark A. and Zhang, Ming-Xing (2015) The Influence of the Effect of Solute on the Thermodynamic Driving Force on Grain Refinement of Al Alloys. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 46 1: 505-515. doi:10.1007/s11661-014-2599-0

Attached Files (Some files may be inaccessible until you login with your UQ eSpace credentials)
Name Description MIMEType Size Downloads
UQ344794_OA.pdf Open access application/pdf 2.03MB 121

Author Wang, Feng
Liu, Zhi-Lin
Qiu, Dong
Taylor, John A.
Easton, Mark A.
Zhang, Ming-Xing
Title The Influence of the Effect of Solute on the Thermodynamic Driving Force on Grain Refinement of Al Alloys
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 2015-01
Year available 2015
Sub-type Article (original research)
DOI 10.1007/s11661-014-2599-0
Open Access Status File (Author Post-print)
Volume 46
Issue 1
Start page 505
End page 515
Total pages 11
Place of publication New York, NY United States
Publisher Springer New York LLC
Collection year 2015
Language eng
Formatted abstract
Grain refinement is known to be strongly affected by the solute in cast alloys. Addition of some solute can reduce grain size considerably while others have a limited effect. This is usually attributed to the constitutional supercooling which is quantified by the growth restriction factor, Q. However, one factor that has not been considered is whether different solutes have differing effects on the thermodynamic driving force for solidification. This paper reveals that addition of solute reduces the driving force for solidification for a given undercooling, and that for a particular Q value, it is reduced more substantially when adding eutectic-forming solutes than peritectic-forming elements. Therefore, compared with the eutectic-forming solutes, addition of peritectic-forming solutes into Al alloys not only possesses a higher initial nucleation rate resulted from the larger thermodynamic driving force for solidification, but also promotes nucleation within the constitutionally supercooled zone during growth. As subsequent nucleation can occur at smaller constitutional supercoolings for peritectic-forming elements, a smaller grain size is thus produced. The very small constitutional supercooling required to trigger subsequent nucleation in alloys containing Ti is considered as a major contributor to its extraordinary grain refining efficiency in cast Al alloys even without the deliberate addition of inoculants.
Keyword Metallic materials
Structural material
Nanotechnolgy
Surfaces and interfaces
Thin Films
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 2016 Collection
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 11 Nov 2014, 00:27:12 EST by System User on behalf of School of Mechanical and Mining Engineering