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Abstract <p>This research investigates the influence of Nb<sub>2</sub>O<sub>5</sub> coatings, produced by using reactive sputtering technique, on the surface of middle-tension specimens <i>M</i>(<i>T</i>), regarding fatigue crack growth curves (<i>da</i>/<i>dN</i> versus Δ<i>K</i>) under exposure to a 0.6 mol L<sup>–1</sup> NaCl saline solution. Results demonstrated the corrosion process occurred in the vicinity of the crack tip, where stresses are elevated, and significant plastic deformation prevails, notably influenced by slip bands that induce microcracks, exposing fresh material layers to the corrosive surroundings. The Nb<sub>2</sub>O<sub>5</sub> coatings enhanced the fatigue-corrosion resistance of the 2198-T851 aluminium alloy. This study marks an initial step towards more comprehensive investigations into the impact of Nb<sub>2</sub>O<sub>5</sub> coating on improving the mechanical properties of the 2198-T851 aluminium alloy.</p>

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Fatigue-Corrosion Studies on the 2198-T851 (Al–Cu–Li) Alloy Containing Nb2O5 Sputtered Coating

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Murilo Oliveira Alves Ferreira,
  • Kaue Ribeiro dos Santos,
  • Rogério Valentim Gelamo,
  • Natália Bueno Leite Slade,
  • Carlos Antônio Reis Baptista,
  • Tiago José Pires de Oliveira,
  • Haroldo Cavalcanti Pinto,
  • Jéferson Aparecido Moreto

摘要

Abstract

This research investigates the influence of Nb2O5 coatings, produced by using reactive sputtering technique, on the surface of middle-tension specimens M(T), regarding fatigue crack growth curves (da/dN versus ΔK) under exposure to a 0.6 mol L–1 NaCl saline solution. Results demonstrated the corrosion process occurred in the vicinity of the crack tip, where stresses are elevated, and significant plastic deformation prevails, notably influenced by slip bands that induce microcracks, exposing fresh material layers to the corrosive surroundings. The Nb2O5 coatings enhanced the fatigue-corrosion resistance of the 2198-T851 aluminium alloy. This study marks an initial step towards more comprehensive investigations into the impact of Nb2O5 coating on improving the mechanical properties of the 2198-T851 aluminium alloy.