Structure and Corrosion Behaviour of Al–Nb Alloys

F. Layachi F. Layachi , M. Y. Debili M. Y. Debili , H. Bedboudi H. Bedboudi
Российский электрохимический журнал
Abstract / Full Text

Effects of niobium content on the microstructure and corrosion were investigated on various Al‒x% Nb alloys (x: 10, 20, 25, 30, 40, and 50 wt %) prepared by high-frequency electromagnetic fusion melting and solidification at room temperature. Microstructural characterization was carried out by X-ray diffraction (XRD), differential scanning calorimetry (DSC), Vickers microhardness, and scanning electron microscopy (SEM). Electrochemical tests in 3.5 wt % NaCl solution, via potentiodynamic polarization curves and impedance spectroscopy (EIS) was accomplished on both as-cast and annealed alloys. All of the results highlight the role played by the intermetallic trialuminide compound Al3Nb dispersed within the matrix consisting of α-Al solid solution. The volume fraction of the Al3Nb intermetallic phase controls the mechanical properties through the microhardness acting as reinforcement of the α-Al matrix in the manner of a composite material. It also acts as a precaution against corrosion by the pitting of aluminum. This effect naturally varies according to the niobium content and the distribution of the intermetallic phase.

Author information
  • Laboratory of Magnetism and Spectroscopy of Solids LM2S, Department of Physics, Faculty of Science, Badji Mokhtar Annaba University BP.12, 23000, Annaba, Algeria

    F. Layachi, M. Y. Debili & H. Bedboudi

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