Mesostructure and porosity effects on the thermal conductivity of additively manufactured interpenetrating phase composites

Moustafa, Abdel R.; Dinwiddie, Ralph B.; Pawlowski, Alexander E.; Splitter, Derek A.; Shyam, Amit; Cordero, Zachary C.

doi:10.1016/j.addma.2018.05.018

Title: Mesostructure and porosity effects on the thermal conductivity of additively manufactured interpenetrating phase composites

Journal Article · Thu May 17 00:00:00 EDT 2018 · Additive Manufacturing

DOI:https://doi.org/10.1016/j.addma.2018.05.018· OSTI ID:1468211

Moustafa, Abdel R. ^[1]; Dinwiddie, Ralph B. ^[2]; Pawlowski, Alexander E. ^[3]; Splitter, Derek A. ^[4]; Shyam, Amit ^[5]; Cordero, Zachary C. ^[1]

Rice Univ., Houston, TX (United States). Materials Science and NanoEngineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center; Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

In this paper, we have investigated the relationship between structure and thermal conductivity in additively manufactured interpenetrating A356/316L composites. We used X-ray microcomputed tomography to characterize the pore structure in as-fabricated composites, finding microporosity in both constituents as well as a 50 μm thick layer of interfacial porosity separating the constituents. We measured the thermal conductivity of a 43 vol% 316L composite to be 53 Wm^-1K^-1, which is significantly less than that predicted by a simple rule-of-mixtures approximation, presumably because of the residual porosity. Motivated by these experimental results we used periodic homogenization theory to determine the combined effects of porosity and unit cell structure on the effective thermal conductivity. This analysis showed that in fully dense composites, the topology of the constituents has a weak effect on the thermal conductivity, whereas in composites with interfacial porosity, the size and structure of the unit cell strongly influence the thermal conductivity. Finally, we also found that an approximation formula of the strong contrast expansion method gives excellent estimates of the effective thermal conductivity of these composites, providing a powerful tool for designing functionally graded composites and for identifying mesostructures with optimal thermal conductivity values.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Rice Univ., Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); Rice Univ. (United States)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1468211

Journal Information:: Additive Manufacturing, Vol. 22; ISSN 2214-8604

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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