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<p>AA7075 aluminum alloys are widely used in aerospace, automotive, and defense industries due to their high strength-to-weight ratio. However, their limited corrosion resistance and mechanical strength under certain conditions pose challenges for broader applications. This study aims to enhance both the mechanical and corrosion properties of AA7075 alloys by incorporating two-dimensional (2D) reinforcements: boron nitride (BN) and MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>), both individually and as a hybrid. Composites were fabricated using powder metallurgy with reinforcement configurations of 5 wt.% BN, 5 wt.% MXene, and a hybrid of 2 wt.% BN + 2 wt.% MXene. Microstructure was examined using SEM and XRD, mechanical properties were assessed by hardness and compression tests, and corrosion behavior was evaluated via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 3.5 wt.% NaCl solution. Results showed that 5 wt.% BN increased hardness by 163.6% and compressive strength by 38.8%, while reducing the corrosion rate by 46.4%. In contrast, 5 wt.% MXene increased hardness by 54.5% and compressive strength by 14.2%, but also increased corrosion rate by 100.5%. The hybrid composition (2% BN + 2% MXene) achieved the highest improvement in hardness (179.7%) and compressive strength (55.4%), while maintaining a moderate corrosion rate increase of only 5.4%. These findings demonstrate that BN significantly enhances corrosion resistance and mechanical performance, while MXene improves mechanical properties but compromises corrosion behavior; their combined use enables a synergistic balance between strength and corrosion resistance.</p>

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Mechanical and Corrosion Properties of BN-MXene (Ti3C2Tx) Reinforced AA7075 Composites

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Muhammet Mevlüt Karaca,
  • İsmail Esen,
  • Safa Polat

摘要

AA7075 aluminum alloys are widely used in aerospace, automotive, and defense industries due to their high strength-to-weight ratio. However, their limited corrosion resistance and mechanical strength under certain conditions pose challenges for broader applications. This study aims to enhance both the mechanical and corrosion properties of AA7075 alloys by incorporating two-dimensional (2D) reinforcements: boron nitride (BN) and MXene (Ti3C2Tx), both individually and as a hybrid. Composites were fabricated using powder metallurgy with reinforcement configurations of 5 wt.% BN, 5 wt.% MXene, and a hybrid of 2 wt.% BN + 2 wt.% MXene. Microstructure was examined using SEM and XRD, mechanical properties were assessed by hardness and compression tests, and corrosion behavior was evaluated via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 3.5 wt.% NaCl solution. Results showed that 5 wt.% BN increased hardness by 163.6% and compressive strength by 38.8%, while reducing the corrosion rate by 46.4%. In contrast, 5 wt.% MXene increased hardness by 54.5% and compressive strength by 14.2%, but also increased corrosion rate by 100.5%. The hybrid composition (2% BN + 2% MXene) achieved the highest improvement in hardness (179.7%) and compressive strength (55.4%), while maintaining a moderate corrosion rate increase of only 5.4%. These findings demonstrate that BN significantly enhances corrosion resistance and mechanical performance, while MXene improves mechanical properties but compromises corrosion behavior; their combined use enables a synergistic balance between strength and corrosion resistance.