Semisolid Casting of Short Freezing Range Alloys

Abstract:

Semisolid casting and non-dendritic solidification of commercially pure tin (about 1 °C freezing range) and Zamak 3 alloy (about 10 °C freezing range) by a modified serpentine channel method were studied. It was shown that semisolid casting of very small freezing range metals with a non-dendritic structure was possible using this method. The results showed that the wall of the copper serpentine channel mold acted as a substrate for heterogeneous copious nucleation of primary solid particles and the channel provided sufficient self-steering action to disperse the nuclei in the melt. The average diameter and shape factor of the primary particles in the semisolid cast CP-Sn sample was measured to be about 107 μm and 0.75, respectively. The average diameter and shape factor of the primary particles in the semisolid cast Zamak 3 alloy was measured to be about 16 μm and 0.8, respectively. Hardness of semisolid samples was slightly higher than those of conventional gravity cast samples.

• Periodical: Solid State Phenomena (Volume 285)
• Pages: 247-252
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.285.247
• Online since: January 2019
• Authors: Farshid Marani, BEHZAD NIROUMAND*
• Keywords: Hardness, Modified Serpentine Channel, Non-Dendritic Structure, Pouring Temperature

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