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Entrained Defects in A356 Semisolid Slurry Produced by RSF and CSC Processes

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Abstract

Semisolid slurry is highly important in rheocasting. In the majority of semisolid slurry preparation methods, the melt is subjected to intensive stirring. In the present study, experiments, simulations, SEM, X-ray computed tomography, and Weibull statistical analysis were used to demonstrate whether intensive stirring would produce casting defects in a semisolid slurry. Rapid slurry forming (RSF) and cooling slope casting (CSC) were carried out to produce an A356 semisolid slurry. The results show that gas pores, shrinkage porosities, and bifilms are found in the produced semisolid slurry. Oxide films are present on the inner walls of gas pores and shrinkage porosities. Gas pores and shrinkage porosities in semisolid slurry produced by CSC are high number, small size, and evenly distributed, but are low number, large size, and concentrated in the center of semisolid slurry produced by RSF. Simulations and experiments confirm that both RSF and CSC processes can cause severe surface turbulence and result in the formation of entrained defects. Moreover, in RSF, the insertion of the rotating EEM (enthalpy exchange material) into the melt can entrain gas and oxide film on the melt surface into the melt. The tensile strengths of samples from quenched semisolid slurries produced by both CSC and RSF show a strong dispersion feature, and both conform to the Weibull distribution.

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Acknowledgments

The authors gratefully acknowledge the supports from the National Natural Science Foundation of China (52165048 and 51764040) and the Jiangxi Province Major Science and Technology Research and Development Special Project (20223AAE02009).

Conflict of interest

On behalf of all authors, the corresponding author states that they have no conflict of interest.

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Authors and Affiliations

  1. School of Physics and Materials Science, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, Jiangxi, P.R. China

    Jiang-Hong Liu, Guo-Hong Li, Hong-Min Guo, Mei-Lan Hu, Lei Yang & Wen Yi

  2. Key Lab of Net Forming in Jiangxi Province, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, Jiangxi, P.R. China

    Hong-Min Guo

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  1. Jiang-Hong Liu
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Liu, JH., Li, GH., Guo, HM. et al. Entrained Defects in A356 Semisolid Slurry Produced by RSF and CSC Processes. Metall Mater Trans B (2024). https://doi.org/10.1007/s11663-024-03082-6

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