Metallurgical and Materials Transactions A

, Volume 34, Issue 13, pp 841–849 | Cite as

Spark plasma sintering of Al-Si-Cu-Fe quasi-crystalline powder

  • E. Fleury
  • J. H. Lee
  • S. H. Kim
  • W. T. Kim
  • J. S. Kim
  • D. H. Kim
Article
Received:

Abstract

This article presents the results of a study on the microstructure and mechanical properties of Al−Si−Cu−Fe specimens produced by the spark plasma sintering (SPS) technique. The microstructure of the starting powder and bulk specimens was analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The formation of the icosahedral and decagonal quasi-crystalline phases in the as-gas-atomized powders is described for the first time. It is then shown that these metastable phases transformed into the 1/1 cubicapproximant phase upon heating at about 600°C. Second, the effects of SPS process parameters such as the temperature and time have been investigated. Owing to the generation of a spark discharge neighboring powder particles, dense cylindrical samples were obtained after a short sintering time of 30 minutes at the temperature of 650°C. The highest values of the Vickers microhardness, about 8.9 GPa, were obtained when the powders were sintered in the temperature range of 600°C to 650°C for a holding time of 30 minutes, while the fracture toughness was found to be inversely proportional to the sintering temperature. However, at the sintering temperature of 650°C, the fracture toughness increased from about 1.40 to 1.52 MPa √m as the holding time increased from 10 to 60 minutes. As compared to cast specimens, the enhanced mechanical properties are explained by the refined microstructure resulting from the low temperature and short sintering time applied during SPS processing

Keywords

Fracture Toughness Material Transaction Spark Plasma Sinter Sinter Time Icosahedral Phase 
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Copyright information

© ASM International & TMS-The Minerals Metals and Materials Society 2003

Authors and Affiliations

  • E. Fleury
    • 1
  • J. H. Lee
    • 2
  • S. H. Kim
    • 3
  • W. T. Kim
    • 4
  • J. S. Kim
    • 5
  • D. H. Kim
    • 1
  1. 1.Center for Non-Crystalline MaterialsYonsei UniversitySeoulKorea
  2. 2.Department of Orthopedic SurgeryASAN Medical CenterSeoulKorea
  3. 3.Kumoh National University of TechnologyKumiKorea
  4. 4.Department of PhysicsChongju UniversityChongjuKorea
  5. 5.Department of Materials Science and EngineeringUlsan UniversityUlsanKorea

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