Electrical conductivity, mechanical strength and corrosion characteristics of spark plasma sintered Al-Nb nanocomposite

C. O. Ujah, A. P.I. Popoola, O. M. Popoola, V. S. Aigbodion

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


An experimental study of the microstructure, electrical conductivity, corrosion characteristics and mechanical strength of Al-Nb nanocomposite consolidated via spark plasma sintering was the focus of this work. The start-up powders as well as the sintered samples were characterised with X-ray diffractometer, transmission electron microscopy and field-emission scanning electron microscope equipped with energy dispersive X-ray spectroscopy. The microhardness of the sintered samples was tested with Vickers hardness tester. The polarisation test was carried out with Potentiostat Autolab. The electrical conductivity was tested with four-point probe meter. The microstructural results showed homogenous dispersion of Nb reinforcement in the matrix, no grain growth and absence of voids. Good corrosion characteristics were achieved with Al-1Nb and Al-4Nb composites while the highest microhardness of 420 MPa and tensile strength of 138 MPa were obtained with Al-4Nb. The electrical conductivity increased from 38.9 to 40.1% IACS with Al-8Nb. The improved properties were as a result of the optimal sintering parameters, good fabrication attributes of SPS and the synergistic effects of Al and Nb.

Original languageEnglish
Pages (from-to)2275-2282
Number of pages8
JournalInternational Journal of Advanced Manufacturing Technology
Issue number9-12
Publication statusPublished - 19 Apr 2019
Externally publishedYes


  • Aluminium
  • Corrosion
  • Electrical conductivity
  • Mechanical strength
  • Niobium
  • Spark plasma sintering

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering


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