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<p>Herein, the effect of Ti addition on the microstructure and electrochemical behavior of cost-effective Co-free AlCrFe<sub>2</sub>Ni<sub>2</sub> high-entropy alloy in a 0.5 M H<sub>2</sub>SO<sub>4</sub> solution was investigated. Upon the introduction of Ti into the AlCrFe<sub>2</sub>Ni<sub>2</sub> alloy, the crystal structure transitioned from face-centered cubic (FCC), body-centered cubic (BCC), and ordered body-centered cubic (B2) phases to a predominantly BCC/B2 structure in the AlCrFe<sub>2</sub>Ni<sub>2</sub>Ti<sub>0.5</sub> alloy. Furthermore, Ti addition increased the volume fraction of the interdendritic regions, and Ti-rich intermetallic regions were formed in the interdendritic regions, resulting in significant grain refinement. In the AlCrFe<sub>2</sub>Ni<sub>2</sub>Ti<sub>0.5</sub> alloy, this unique structure mitigates the negative influences of the dual-phase architecture and element segregation on corrosion performance, thereby promoting the formation of a more stable and thicker passive oxide film. These findings demonstrate that introducing Ti, as an excellent corrosion-resistant element, was an effective strategy for significantly improving the electrochemical behavior of cost-effective Co-free AlCrFeNi high-entropy alloys.</p>

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Study synergistic effect of Ti addition on microstructure and electrochemical performance of cost-effective Co-free AlCrFeNi high-entropy alloy with dual-phase architecture

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月15日

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  • Majid Naseri,
  • Omid Imantalab,
  • Amir Farrokhi,
  • Ali Shanaghi,
  • Tushar Sonar,
  • Artem Okulov

摘要

Herein, the effect of Ti addition on the microstructure and electrochemical behavior of cost-effective Co-free AlCrFe2Ni2 high-entropy alloy in a 0.5 M H2SO4 solution was investigated. Upon the introduction of Ti into the AlCrFe2Ni2 alloy, the crystal structure transitioned from face-centered cubic (FCC), body-centered cubic (BCC), and ordered body-centered cubic (B2) phases to a predominantly BCC/B2 structure in the AlCrFe2Ni2Ti0.5 alloy. Furthermore, Ti addition increased the volume fraction of the interdendritic regions, and Ti-rich intermetallic regions were formed in the interdendritic regions, resulting in significant grain refinement. In the AlCrFe2Ni2Ti0.5 alloy, this unique structure mitigates the negative influences of the dual-phase architecture and element segregation on corrosion performance, thereby promoting the formation of a more stable and thicker passive oxide film. These findings demonstrate that introducing Ti, as an excellent corrosion-resistant element, was an effective strategy for significantly improving the electrochemical behavior of cost-effective Co-free AlCrFeNi high-entropy alloys.