Effect of annealing and metallurgical treatments on thermal conductivity of aluminium alloys

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Abstract

This article examines factors affecting the thermal conductivity of aluminium alloys. More specifically, thermal conductivity is measured with the Hot Disk method. The work shows that improvements as high as 50 % in thermal conductivity can be achieved through heat treatment of the studied alloys. Optical microscopy and scanning electron microscopy indicate that some elements in solid solution (particularly silicon) precipitate in aluminium grains during annealing. Modifying the microstructure with strontium and sodium increases thermal conductivity slightly, whereas rheocasting and grain refinement treatments do not affect thermal conductivity. AlB treatment improves thermal conductivity especially in low-silicon primary aluminium alloys. As-cast and heat-treated thermal conductivities of the studied alloys are calculated by applying Matthiessen's rule and the Wiedemann-Franz law and compared to the measured thermal conductivity.

Details

Original languageEnglish
Pages (from-to)157-171
Number of pages15
JournalINTERNATIONAL JOURNAL OF METALCASTING
Volume10
Issue number2
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Aluminium alloy, Annealing, Grain refinement, Modification, Rheocasting, Thermal conductivity

ID: 2035179