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<p>In this study, four AlCrCuFeNi-based high-entropy alloys (HEAs) with different Ag contents were synthesized by mechanical alloying (MA) to evaluate their microstructure, hardness, and corrosion resistance for protective coating applications. Ag was incorporated by partially replacing Al at 5, 10, and 15&#xa0;at.% levels. XRD and SEM/EDS analyses confirmed the formation of nanocrystalline FCC and BCC solid solutions, although Ag-rich segregated phases appeared at higher Ag contents. The base AlCrCuFeNi alloy showed the highest hardness (455&#xa0;HV), more than twice that of 1045 steel, while the Ag<sub>5</sub>Al<sub>15</sub>CrCuFeNi alloy retained ~ 30% higher hardness and superior corrosion resistance compared with steel. In contrast, higher Ag contents led to reduced hardness and increased galvanic corrosion due to Ag segregation. Overall, MA proved effective to incorporate Ag into HEAs, with AlCrCuFeNi and Ag<sub>5</sub>Al<sub>15</sub>CrCuFeNi identified as promising candidates for protective coatings in mechanical components exposed to saline or corrosive environments.</p> Graphical abstract <p></p>

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Effect of Ag addition on the microstructure and properties of AlCrCuFeNi high-entropy alloys synthesized by mechanical alloying for protective coating applications

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • E. Servín,
  • A. Molina-Ocampo,
  • S. R. Gonzaga,
  • M. Serrano,
  • A. Torres-Islas,
  • M. C. Juarez,
  • H. Villanueva

摘要

In this study, four AlCrCuFeNi-based high-entropy alloys (HEAs) with different Ag contents were synthesized by mechanical alloying (MA) to evaluate their microstructure, hardness, and corrosion resistance for protective coating applications. Ag was incorporated by partially replacing Al at 5, 10, and 15 at.% levels. XRD and SEM/EDS analyses confirmed the formation of nanocrystalline FCC and BCC solid solutions, although Ag-rich segregated phases appeared at higher Ag contents. The base AlCrCuFeNi alloy showed the highest hardness (455 HV), more than twice that of 1045 steel, while the Ag5Al15CrCuFeNi alloy retained ~ 30% higher hardness and superior corrosion resistance compared with steel. In contrast, higher Ag contents led to reduced hardness and increased galvanic corrosion due to Ag segregation. Overall, MA proved effective to incorporate Ag into HEAs, with AlCrCuFeNi and Ag5Al15CrCuFeNi identified as promising candidates for protective coatings in mechanical components exposed to saline or corrosive environments.

Graphical abstract