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Sayyedan, F. S.
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article
Enhancing surface properties of (Fe,Cr)Al – Al2O3 nanocomposite by oxygen ion implantation
Abstract
Ion implantation has been used as a surface treatment technique on (Fe,Cr)Al-10%vol Al<sub>2</sub>O<sub>3</sub> nanocomposite to enhance its surface properties. The process was carried out at 150 kV with an oxygen dose of 1 × 10<sup>18</sup> ions/cm<sup>2</sup> at room temperature. Microstructural characterization and phase composition were performed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) of the Al<sub>2</sub>O<sub>3</sub> layer formed on the nanocomposite surface. Mechanical properties measurements including hardness, fracture toughness and coefficient of friction were studied. Nanoindentation tests demonstrated an increase of 50% in the hardness value after ion implantation. Fracture toughness increased to a value of 21.3 ± 0.9 MPa m<sup>1/2</sup> after O<sub>2</sub> ion implantation. Scratch test results revealed an improvement in tribological behavior of the oxygen implanted surface compared to the un-implanted substrate. Cyclic oxidation tests, at 1100 °C, revealed that oxygen ion implantation slightly improved high temperature oxidation resistance of the nanocomposite.