Electrical conductivity, mechanical strength and corrosion characteristics of spark plasma sintered Al-Nb nanocomposite
- 15 Downloads
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.
KeywordsNiobium Spark plasma sintering Mechanical strength Aluminium Corrosion Electrical conductivity
Unable to display preview. Download preview PDF.
The authors would like to acknowledge Centre for Energy and Electric Power (CEEP), Tshwane University of Technology, Pretoria, NRF and DHET for providing financial aid in part for this project.
- 8.Abbas MK (2010) Effects of friction stir welding on the microstructure and corrosion behaviour of aluminium alloy AA6061-T651. In Proceedings of the 2nd regional Conference for engineering sciences. (pp. 1–2), BaghdadGoogle Scholar
- 10.Loto RT, Babalola P (2017) Corrosion polarization behaviour and microstructural analysis of AA1070 aluminium silicon carbide matrix composites in acid chloride concentrations. Cogent Eng 4. https://doi.org/10.1080/23311916.2017.1422229
- 15.Delaizir G, Bernard-Granger G, Monnier J, Grodzki R, Kim-Hak O, Szkutnik PD, Soulier M, Saunier S, Goeuriot D, Rouleau O (2012) A comparative study of spark plasma sintering (SPS), hot isostatic pressing (HIP) and microwaves sintering techniques on p-type Bi 2 Te 3 thermoelectric properties. Mater Res Bull 47:1954–1960CrossRefGoogle Scholar
- 17.Chieh K, Te-Tan L, Kuo-Hwa T, Kuo-Ying C, Ming-Shuing C (2009) The influences of powder mixing process on the quality of W-cu composites. J Trans Canada Soc Mech Engr 33:3Google Scholar
- 18.Ujah CO, Popoola API, Popoola OM, Aigbodion VS (2018) Optimisation of spark plasma sintering parameters of Al-CNTs-Nb nano-composite using Taguchi Design of Experiment. Int J Adv Manuf Technol. https://doi.org/10.1007/s00170-018-2705-3
- 19.Cahoon JR, Broughton WH, Kutzak AR (1983) The determination of yield strength from hardness measurements. Metal Trans 2:1979–1983Google Scholar
- 21.Callister J, William D (2005) Fundamentals of materials science and engineering, 2nd edn. John Wiley and sons, USA, p 199. isbn:ISBN: 978-0-471-47014-4Google Scholar
- 25.AzoNetwork (2018) Aluminium alloys aluminium 1050 properties, fabrication and applications. https://www.azom.com/article.aspx?ArticleID=2798
- 26.Sher H, Zallen R (1970) Journal of. Chem Phys 53:3759–3761Google Scholar
- 27.Oladijo OP, Obadele BA, Venter AM, Cornish LA (2016) Investigating the effect of porosity on corrosion resistance and hardness of WC-co coatings on metal substrates. African Corr J 2:1Google Scholar