Grain coarsening of cast magnesium alloys at high cooling rate: a new observation

Ali, Yahia, You, Guoqiang, Pan, Fusheng and Zhang, Ming-Xing (2016) Grain coarsening of cast magnesium alloys at high cooling rate: a new observation. Metallurgical and Materials Transactions A, 1-8. doi:10.1007/s11661-016-3852-5


Author Ali, Yahia
You, Guoqiang
Pan, Fusheng
Zhang, Ming-Xing
Title Grain coarsening of cast magnesium alloys at high cooling rate: a new observation
Journal name Metallurgical and Materials Transactions A   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2016-10-27
Sub-type Article (original research)
DOI 10.1007/s11661-016-3852-5
Open Access Status Not yet assessed
Start page 1
End page 8
Total pages 8
Place of publication New York, NY, United States
Publisher Springer New York LLC
Language eng
Abstract Most studies in the area of grain refinement have always taken for granted that higher cooling rate results in finer grains. However, when microstructural variation of the as-cast Mg with cooling rate was investigated using a specially designed V-shaped copper mold, the results were different. Although fast cooling during solidification led to microstructural refining in pure Mg, grain coarsening was observed at a higher cooling rate in Mg alloys that were inoculation treated with 1.0wt pctZr and 1.4wt pctCaO, and in the Mg-Al binary alloys. It is considered that the grain coarsening at higher cooling rate was attributed to the smaller constitutional undercooling zone formed at fast cooling due to the high temperature gradient in the three Mg alloys. These results can help in redefining the role of cooling rate in the grain refinement process.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Created: Tue, 15 Nov 2016, 10:46:51 EST by System User on behalf of Learning and Research Services (UQ Library)