For successful modelling of the solidification process, a reliable heat transfer boundary condition data is required. These boundary conditions are significantly influenced by the casting and mould parameters. In the present work, the effect of sodium modification melt treatment on casting/chill interfacial heat transfer during upward solidification of an Al-13% Si alloy against metallic chills is investigated using thermal analysis and inverse modelling techniques. In the presence of chills, modification melt treatment resulted in an increase in the cooling rate of the solidifying casting near the casting/chill interfacial region. The corresponding interfacial heat flux transients and electrical conductivities are also found to be higher. This is attributed to (i) improvement in the casting/chill interfacial thermal contact condition brought about by the decrease in the surface tension of the liquid metal on addition of sodium and (ii) increase in the electronic heat conduction in the initial solidified shell due to change in the morphology of silicon from a acicular type to a fine fibrous structure and increase in the ratio of the modification rating to the secondary dendrite arm spacing. © 2003 Elsevier B.V. All rights reserved.

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dc.contributor.authorPrabhu, K.
dc.contributor.authorRavishankar, B.N.
dc.date.accessioned2026-02-05T11:00:21Z
dc.date.issuedEffect of modification melt treatment on casting/chill interfacial heat transfer and electrical conductivity of Al-13% Si alloy
dc.description.abstract2003
dc.identifier.citationMaterials Science and Engineering: A, 2003, 360, 46054, pp. 293-298
dc.identifier.issn9215093
dc.identifier.urihttps://doi.org/10.1016/S0921-5093(03)00467-2
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/27969
dc.publisherElsevier BV
dc.subjectAluminum alloys
dc.subjectBoundary conditions
dc.subjectElectric conductivity
dc.subjectHeat transfer
dc.subjectInterfaces (materials)
dc.subjectMetal casting
dc.subjectMorphology
dc.subjectSilicon alloys
dc.subjectSolidification
dc.subjectMelt treatment
dc.subjectMaterials science
dc.subjectaluminum alloy
dc.subjectelectrical conductivity
dc.titleFor successful modelling of the solidification process, a reliable heat transfer boundary condition data is required. These boundary conditions are significantly influenced by the casting and mould parameters. In the present work, the effect of sodium modification melt treatment on casting/chill interfacial heat transfer during upward solidification of an Al-13% Si alloy against metallic chills is investigated using thermal analysis and inverse modelling techniques. In the presence of chills, modification melt treatment resulted in an increase in the cooling rate of the solidifying casting near the casting/chill interfacial region. The corresponding interfacial heat flux transients and electrical conductivities are also found to be higher. This is attributed to (i) improvement in the casting/chill interfacial thermal contact condition brought about by the decrease in the surface tension of the liquid metal on addition of sodium and (ii) increase in the electronic heat conduction in the initial solidified shell due to change in the morphology of silicon from a acicular type to a fine fibrous structure and increase in the ratio of the modification rating to the secondary dendrite arm spacing. © 2003 Elsevier B.V. All rights reserved.

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