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<p>High-entropy alloys are a fascinating and rapidly expanding branch of materials research that provides potential solutions for applications that require a mix of strength, toughness, and resistance to harsh conditions. Their distinct set of features results from the high configurational entropy and equal mixing of numerous constituents. However, their suitability for diverse applications is dependent on their resistance to failure when exposed to various degradation environments, particularly basic and acidic situations. To address the increasing demand, alloys with stable characteristics and the ability to survive extreme circumstances must be developed. As such, this study assesses the mechanical characteristics and corrosion resistance of FeTiCrMoNb refractory HEA. Analytical experiments utilizing scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to assess the microstructural properties of the resulting alloys. Subjection of the alloy to annealing heat treatment at different temperatures yielded better microhardness properties. The sample treated at 1000&#xa0;°C had the highest microhardness value of around 940&#xa0;HV. When the alloy was exposed to annealing conditions at 600&#xa0;°C and 800&#xa0;°C, its strength was improved more than 14.6 and 16.2 times, respectively. The ductility was also improved by 2.5 and 2.4, respectively, under the same conditions. The highest corrosion potential of − 0.3&#xa0;V and current density of 6.1 × 10-7&#xa0;A/cm2 were recorded for the sample annealed at 1000&#xa0;°C in H<sub>2</sub>SO<sub>4</sub>.</p>

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Effects of Annealing Temperature on the Corrosion and Mechanical Properties of FeTiCrMoNb Refractory High-Entropy Alloys

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月28日

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  • P. Mpofu,
  • N. Malatji,
  • M. B. Shongwe,
  • L. R. Kanyane

摘要

High-entropy alloys are a fascinating and rapidly expanding branch of materials research that provides potential solutions for applications that require a mix of strength, toughness, and resistance to harsh conditions. Their distinct set of features results from the high configurational entropy and equal mixing of numerous constituents. However, their suitability for diverse applications is dependent on their resistance to failure when exposed to various degradation environments, particularly basic and acidic situations. To address the increasing demand, alloys with stable characteristics and the ability to survive extreme circumstances must be developed. As such, this study assesses the mechanical characteristics and corrosion resistance of FeTiCrMoNb refractory HEA. Analytical experiments utilizing scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to assess the microstructural properties of the resulting alloys. Subjection of the alloy to annealing heat treatment at different temperatures yielded better microhardness properties. The sample treated at 1000 °C had the highest microhardness value of around 940 HV. When the alloy was exposed to annealing conditions at 600 °C and 800 °C, its strength was improved more than 14.6 and 16.2 times, respectively. The ductility was also improved by 2.5 and 2.4, respectively, under the same conditions. The highest corrosion potential of − 0.3 V and current density of 6.1 × 10-7 A/cm2 were recorded for the sample annealed at 1000 °C in H2SO4.