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<p>FeCoNiCrSix and FeCoNiCrTix high-entropy alloys (HEAs), with x values of 0, 0.3, 0.6, and 0.9 wt.%, were produced via powder metallurgy. This research offers a comprehensive analysis of their density, hardness, wear resistance, corrosion behavior, microstructure, and elemental composition before and after exposure to corrosive environments. The influence of temperature and pH in oxy-acid solutions (H<sub>2</sub>SO<sub>4</sub> and HNO<sub>3</sub>) at different concentrations (2%, 5%, and 8%) on corrosion rates was examined using response surface methodology (RSM) with a central composite design (CCD). The study’s novelty lies in its comparative evaluation of the localized corrosion performance of Si- and Ti-alloyed FeCoNiCr-based HEAs under harsh acidic conditions, along with the use of RSM to optimize corrosion resistance across multiple variables. Interactions between temperature and pH were statistically analyzed, and corrosion rates, measured using the gravimetric method, were optimized using RSM. The minimum corrosion rates recorded were 80&#xa0;mm/y for FeCoNiCrSix and 140&#xa0;mm/y for FeCoNiCrTix, highlighting their potential for acid-resistant applications.</p>

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Optimization of Experimental Variables for FeCoNiCrSix and FeCoNiCrTix High-Entropy Alloys Using Response Surface Methodology

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Ghalia A. Gaber,
  • Lamiaa Z. Mohamed,
  • Omayma A. Elkady,
  • Sarah Hedya,
  • H. Megahed,
  • Shimaa Abolkassem

摘要

FeCoNiCrSix and FeCoNiCrTix high-entropy alloys (HEAs), with x values of 0, 0.3, 0.6, and 0.9 wt.%, were produced via powder metallurgy. This research offers a comprehensive analysis of their density, hardness, wear resistance, corrosion behavior, microstructure, and elemental composition before and after exposure to corrosive environments. The influence of temperature and pH in oxy-acid solutions (H2SO4 and HNO3) at different concentrations (2%, 5%, and 8%) on corrosion rates was examined using response surface methodology (RSM) with a central composite design (CCD). The study’s novelty lies in its comparative evaluation of the localized corrosion performance of Si- and Ti-alloyed FeCoNiCr-based HEAs under harsh acidic conditions, along with the use of RSM to optimize corrosion resistance across multiple variables. Interactions between temperature and pH were statistically analyzed, and corrosion rates, measured using the gravimetric method, were optimized using RSM. The minimum corrosion rates recorded were 80 mm/y for FeCoNiCrSix and 140 mm/y for FeCoNiCrTix, highlighting their potential for acid-resistant applications.