ABSTRACT

Quasicrystalline (QC) AlCuFe coating is produced on the AA2024 alloy using high-velocity air-fuel (HVAF) spraying. The HVAF sprayed coatings are studied in as-deposited and subsequently annealed (400°C, 1 h) states. XRD, SEM, and EDX analysis revealed a two-phase microstructure comprising QC icosahedral ψ-phase (the volume fraction of ∼75%) and interlayered bcc β-phase that remains the same as that in a water-atomized AlCuFe powder used as feeding material. The used annealing exerts a negligible effect on the protective properties of the HVAF coating that possesses good adhesion strength (>12 MPa), a high HV microhardness (7.1 ± 0.2 GPa), nanohardness (11.1 ± 0.2 GPa), elastic modulus (169 GPa), the essentially lowered wear losses (0.71 μm), coefficient of friction (CoF≈0.03), and corrosion current density (6.7 μm cm⁻²) in a 3.5%NaCl medium. These characteristics are much better than those of the original AA2024 alloy.

摘要

准晶 (QC) AlCuFe 涂层是通过高速空气燃料 (HVAF) 喷涂在 AA2024 合金上生成的。在沉积状态和随后的退火（400°C，1 小时）状态下研究 HVAF 喷涂涂层。XRD、SEM 和 EDX 分析揭示了两相微观结构，包括 QC 二十面体 ψ 相（体积分数~75%）和层间 bcc β 相，与用作进料的水雾化 AlCuFe 粉末中的结构相同材料。退火对HVAF涂层的防护性能影响可以忽略不计，涂层具有良好的附着强度（>12 MPa）、高HV显微硬度（7.1±0.2 GPa）、纳米硬度（11.1±0.2 GPa）、弹性模量（169 GPa） ），显着降低磨损量（0.71 μm）、摩擦系数（CoF≈0.03）和腐蚀电流密度（6.7 μm cm ^-2）在 3.5% NaCl 介质中。这些特性比原来的AA2024合金好得多。