Effects of cooling rate and solute content on the grain refinement of Mg-Gd-Y alloys by aluminum

Dai, Jichun, Easton, Mark A., Zhang, Mingxing, Qiu, Dong, Xiong, Xiangyuan, Liu, Wencai and Wu, Guohua (2014) Effects of cooling rate and solute content on the grain refinement of Mg-Gd-Y alloys by aluminum. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 45 10: 4665-4678. doi:10.1007/s11661-014-2390-2

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Author Dai, Jichun
Easton, Mark A.
Zhang, Mingxing
Qiu, Dong
Xiong, Xiangyuan
Liu, Wencai
Wu, Guohua
Title Effects of cooling rate and solute content on the grain refinement of Mg-Gd-Y alloys by aluminum
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 2014
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s11661-014-2390-2
Open Access Status File (Author Post-print)
Volume 45
Issue 10
Start page 4665
End page 4678
Total pages 14
Place of publication New York, NY United States
Publisher Springer New York LLC
Collection year 2015
Language eng
Abstract The effect of Al additions on grain refinement of Mg-Gd-Y alloys with different solute contents at different cooling rates has been investigated. For all alloys, significant grain refinement was due to the formation of Al 2(Gd x Y1-x ) nucleant particles. The number density and size distribution of Al2(Gd x Y1-x ) were affected by both solute content and the cooling rate. Grain sizes (d gs) of Mg-Gd-Y base alloys and of Mg-Gd-Y-Al alloys were related to solute content (defined by the growth restriction factor, Q), cooling rate (Ṫ), and area number density (ρ ns) and size (d p) of nucleant particles that can be activated. It is found that grain sizes of Mg-Gd-Y base alloys follow the relationship dgs = a + b/Q√Ṫ, while grain sizes of Al-refined samples follow the relationship dgs = a′/√ρns + b′√Ṫ Qdp, where a, b, a′, and b′ were constants. In addition, the grain refinement effect of Al additions was more susceptible to solute content and the cooling rate than that of Zr which is regarded as the most efficient grain refiner for Mg alloys.
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 2015 Collection
 
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