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Metallurgical and Materials Transactions A

, Volume 37, Issue 8, pp 2569–2579 | Cite as

Bulk nanocrystalline aluminum 5083 alloy fabricated by a novel technique: Cryomilling and spark plasma sintering

  • Jichun Ye
  • Leonardo Ajdelsztajn
  • Julie M. Schoenung
Article

Abstract

Dense, bulk nanocrystalline aluminum 5083 alloy was fabricatedvia a combined technique: cryomilling (mechanical milling at cryogenic temperature) to achieve the nanocrystalline Al 5083 powder and spark plasma sintering (SPS) to consolidate the cryomilled powder. The results of X-ray diffraction analysis indicate that the average grain size in the SPS consolidated material is 51 nm, one of the smallest grain sizes ever reported in bulk Al alloys produced by powder metallurgy derived methods. In contrast, transmission electron microscopy (TEM) analysis revealed a bimodal grain size distribution, with an average grain size of 47 nm in the fine-grained regions and approximately 300 nm in the coarse-grained regions. Nanoindentation was used to evaluate the mechanical properties and the uniformity of the consolidated nanocrystalline Al 5083. The hardness of the material is greatly improved over that of the conventional equivalent, due to the fine grain size. The mechanisms for spark plasma sintering and the microstructural evolution are discussed on the basis of the experimental findings.

Keywords

Material Transaction Spark Plasma Sinter Mechanical Milling Plastic Yielding Spark Plasma Sinter Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2006

Authors and Affiliations

  • Jichun Ye
    • 1
  • Leonardo Ajdelsztajn
    • 1
  • Julie M. Schoenung
    • 1
  1. 1.the Department of Chemical Engineering and Materials ScienceUniversity of CaliforniaDavis

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