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Metals 2017, 7(6), 204; doi:10.3390/met7060204

Effect of Cooling Rate on Microstructure and Grain Refining Behavior of In Situ CeB6/Al Composite Inoculant in Aluminum

Key Laboratory for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
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Academic Editor: Murat Tiryakioglu
Received: 28 April 2017 / Revised: 28 May 2017 / Accepted: 31 May 2017 / Published: 2 June 2017
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Abstract

Melt spinning was performed to process an in situ CeB6/Al inoculant at different rotating speeds to investigate the influence of cooling rate on the grain refining behavior of inoculants. It has been found that a high cooling rate caused two obvious changes in the inoculant: the supersaturated solid solution of Ce in the α-Al matrix and the miniaturization of CeB6 particles. At high cooling rates of ~108 K/s, the Ce content is largely beyond the theoretical solid solubility of Ce in Al, and the size of the CeB6 particles in ribbons is reduced to ~100 nm. The grain refining effect of melt-spun CeB6/Al composite inoculant shows significant dependence on holding time of which the best value should be no more than 2 min. The excellent grain refinement of the inoculant can be attributed to the combined effect of the nano-sized refiner particles and the large undercooling caused by the sudden melting of supersaturated Al–Ce solution. View Full-Text
Keywords: melt spinning; in situ Al matrix composite; Inoculation; Cerium hexaboride; microstructure; mechanism melt spinning; in situ Al matrix composite; Inoculation; Cerium hexaboride; microstructure; mechanism
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MDPI and ACS Style

Liu, S.; Cui, C.; Wang, X.; Li, N.; Shi, J.; Cui, S.; Chen, P. Effect of Cooling Rate on Microstructure and Grain Refining Behavior of In Situ CeB6/Al Composite Inoculant in Aluminum. Metals 2017, 7, 204.

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