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Materials 2016, 9(12), 1001; doi:10.3390/ma9121001

The Refining Mechanism of Super Gravity on the Solidification Structure of Al-Cu Alloys

1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Zinigrad
Received: 15 October 2016 / Revised: 26 November 2016 / Accepted: 30 November 2016 / Published: 10 December 2016
(This article belongs to the Special Issue Welding, Joining and Casting of Advanced Materials)
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Abstract

There is far less study of the refining effect of super gravity fields on solidification structures of metals than of the effects of electrical currents, magnetic and ultrasonic fields. Moreover, the refining mechanisms of super gravity are far from clear. This study applied a super gravity field to Al-Cu alloys to investigate its effect on refining their structures and the mechanism of interaction. The experimental results showed that the solidification structure of Al-Cu alloys can be greatly refined by a super gravity field. The major refining effect was mainly achieved when super gravity was applied at the initial solidification stage; only slight refinement could be obtained towards the end of solidification. No refinement was obtained by the super gravity treatment on pure liquid or solid stages. The effectiveness of super gravity results from its promoting the multiplication of crystal nuclei, which we call “Heavy Crystal Rain”, thereby greatly strengthening the migration of crystal nuclei within the alloy. Increasing the solute Cu content can increase nucleation density and restrict the growth of crystals, which further increases the refining effect of super gravity. Within this paper, we also discuss the motile behavior of crystals in a field of super gravity. View Full-Text
Keywords: super gravity; solidification structure; refining mechanism; Al-Cu alloy super gravity; solidification structure; refining mechanism; Al-Cu alloy
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Yang, Y.; Song, B.; Yang, Z.; Song, G.; Cai, Z.; Guo, Z. The Refining Mechanism of Super Gravity on the Solidification Structure of Al-Cu Alloys. Materials 2016, 9, 1001.

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