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<p>High entropy alloy nitrided (HEAN) films have attracted much attention due to excellent properties, but the maximum solid solubility of nitrogen limits further exploration. In this study, to improve the nitrogen content and regulate widely the microstructure and properties of Al<sub>0.5</sub>CoCrFeNi films, Ti was introduced by magnetron sputtering. The highest nitrogen content reached 33.5 at%, revealing the evolution of microstructure, mechanical properties and corrosion properties with nitrogen content. Remarkably, the newly formed FCC2 phase increased and the FCC1 + BCC phase decreased with increasing nitrogen content. The surface cluster particles and the cross-sectional columnar crystals gradually grew finer. The film at <i>R</i><sub><i>N</i></sub> = 40% showed the best comprehensive performance due to the dense structure. The hardness and modulus reached 15.50&#xa0;GPa and 214.8&#xa0;GPa, and the corrosion potential and current density reached 0.146&#xa0;V and 0.48&#xa0;μA/cm<sup>2</sup>, respectively. Therefore, the addition of strong nitrogen metal elements provides a new idea for breaking through the limitation of alloy interstitial element concentration.</p>

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Tailoring Mechanical Properties and Corrosion Resistance of Al0.5CoCrFeNi Films through Ti and N Incorporation

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Senlong He,
  • Feng Wang,
  • Fanyong Zhang,
  • Honglu Ma,
  • Hongshu Jin,
  • Ying Luo,
  • Liangquan Wang

摘要

High entropy alloy nitrided (HEAN) films have attracted much attention due to excellent properties, but the maximum solid solubility of nitrogen limits further exploration. In this study, to improve the nitrogen content and regulate widely the microstructure and properties of Al0.5CoCrFeNi films, Ti was introduced by magnetron sputtering. The highest nitrogen content reached 33.5 at%, revealing the evolution of microstructure, mechanical properties and corrosion properties with nitrogen content. Remarkably, the newly formed FCC2 phase increased and the FCC1 + BCC phase decreased with increasing nitrogen content. The surface cluster particles and the cross-sectional columnar crystals gradually grew finer. The film at RN = 40% showed the best comprehensive performance due to the dense structure. The hardness and modulus reached 15.50 GPa and 214.8 GPa, and the corrosion potential and current density reached 0.146 V and 0.48 μA/cm2, respectively. Therefore, the addition of strong nitrogen metal elements provides a new idea for breaking through the limitation of alloy interstitial element concentration.