Semisolid slurry of 7A04 aluminum alloy prepared by electromagnetic stirring and Sc, Zr additions

Slurry preparation is one of the most critical steps for semisolid casting, and its primary goal is to prepare slurry with uniformly distributed fine globules. In this work, electromagnetic stirring（EMS） and the addition of Sc and Zr elements were used to prepare semisolid slurry of 7A04 aluminum al...

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Bibliographic Details
Published in:China foundry 2017-05, Vol.14 (3), p.188-193
Main Authors: Zhao, Jun-wen, Guo, An, Li, Hu, Zhang, Xu, Han, Jing, Wu, Shu-sen
Format: Article
Language:English
Subjects:
Alloys
Aluminum (Metal)
aluminum alloy
Zr and Sc additions
semisolid slurry
electromagnetic stirring (EMS)
homogeneity
Comparative analysis
Electromagnetism
Engineering
Machines
Manufacturing
Materials Engineering
Metallic Materials
Processes
Research & Development
Specialty metals industry
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Summary:Slurry preparation is one of the most critical steps for semisolid casting, and its primary goal is to prepare slurry with uniformly distributed fine globules. In this work, electromagnetic stirring（EMS） and the addition of Sc and Zr elements were used to prepare semisolid slurry of 7A04 aluminum alloy in a large diameter slurry maker. The effects of different treatments on the microstructure, composition and their radial homogeneity were investigated. The results show that, compared to the slurry without any treatment, large volume slurry with finer and more uniform microstructure can be obtained when treated by EMS, Sc, or Zr additions individually. EMS is more competent in the microstructural and chemical homogenization of the slurry while Sc and Zr additions are more excellent in its microstructural refinement. The combined treatment of EMS, Sc and Zr produces premium 7A04 aluminum alloy slurry with uniformly distributed fine α-Al globules and composition. The interaction mechanism between EMS and Sc and Zr additions was also discussed.
ISSN:1672-6421
2365-9459
1672-6421
DOI:10.1007/s41230-017-6115-1