Article

Metallurgical and Materials Transactions A

, Volume 44, Issue 4, pp 1908-1916

Spark Plasma Sintering of Nanostructured Aluminum: Influence of Tooling Material on Microstructure

  • Dongming LiuAffiliated withDepartment of Materials Science and Engineering, Shandong UniversityDepartment of Chemical Engineering and Materials Science, University of California Davis
  • , Yuhong XiongAffiliated withDepartment of Chemical Engineering and Materials Science, University of California Davis
  • , Ying LiAffiliated withDepartment of Chemical Engineering and Materials Science, University of California Davis
  • , Troy D. ToppingAffiliated withDepartment of Chemical Engineering and Materials Science, University of California Davis
  • , Yizhang ZhouAffiliated withDepartment of Chemical Engineering and Materials Science, University of California Davis
  • , Chris HainesAffiliated withPowder Metallurgy & Particulate Technology, US Army, TACOM-ARDEC
  • , Joseph ParasAffiliated withPowder Metallurgy & Particulate Technology, US Army, TACOM-ARDEC
  • , Darold MartinAffiliated withPowder Metallurgy & Particulate Technology, US Army, TACOM-ARDEC
  • , Deepak KapoorAffiliated withPowder Metallurgy & Particulate Technology, US Army, TACOM-ARDEC
    • , Julie M. SchoenungAffiliated withDepartment of Chemical Engineering and Materials Science, University of California Davis
    • , Enrique J. LaverniaAffiliated withDepartment of Chemical Engineering and Materials Science, University of California Davis Email author 

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Abstract

The influence of tooling material, i.e., graphite and WC-Co, on the microstructure of a spark plasma sintering (SPS) consolidated, nanostructured aluminum alloy is studied in this paper. The results show that tooling selection influences microstructure evolution, independent of process parameters. The influence of tooling on microstructure is rationalized on the basis of the following factors: heating rate, electrical current density, localized heating, and imposed pressure. A theoretic framework, based on the physical properties of graphite and WC-Co, is formulated to explain the observed behavior.