Thermomechanical Characterization of AlSi10Mg TPMS Structures Fabricated by Additive Manufacturing for Heat Sinks Applications

  • Alya Alhammadi

Student thesis: Master's Thesis

Abstract

The evolution of electronic devices is associated with a requirement for more effective thermal management devices. The enhancement of heat dissipation requires the maximization of the surface area of the devices. Additive manufacturing has enabled the fabrication of novel thermal management devices with intricate details that could be the key to enhancing the surface area. In this work, the potential of employing additively manufactured metallic triply periodic minimal surfaces (TPMS) cellular structures as heat sinks is explored. TPMS structures are chosen because of their high surface area to volume ratio, which makes them ideal for heat sink applications, particularly in electronics where there is a constraint in the size of heat sinks employed. To evaluate the potential of these structures, the operation conditions of heat sinks are mimicked, and the resulting thermomechanical loads are evaluated. The cellular structures are fabricated through laser powder bed fusion with AlSi10Mg as the base material. The microstructure and thermomechanical properties of the base material are also studied in-depth in this work, to assess the effect of the base material properties as well as evaluate the printing quality and analyze potential sources of defects in the structures. The results confirmed TPMS structures' suitability as heat sink designs, as they maintained their mechanical properties at the operation temperature, particularly when fabricated at low relative densities.
Date of AwardOct 2019
Original languageAmerican English

Keywords

  • thermal management
  • heat sinks
  • triply periodic minimal surfaces
  • powder bed fusion

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