Abstract
To study the effect of thermal cold cycling on the microstructure and properties of Al–Cu–Mg–Ag alloy, hardness and tensile tests, resistivity tests, friction and wear tests, intergranular corrosion, and electrochemical corrosion tests were used to explore its mechanical properties, wear resistance, and corrosion resistance changes. Laser confocal microscopy, scanning electron microscopy, optical microscopy, and transmission electron microscopy were used to observe and analyze the wear morphology, corrosion conditions, and microstructure of the alloy. The results show that after thermal cold cycling, the phase of the Al–Cu–Mg–Ag alloy is a fine and dense Ω phase, and the microstructure is significantly optimized, effectively improving the properties of the alloy. As the number of cycles increases, the properties of the alloy change accordingly, when thermal cold cycled twice (TCC2), the small Ω phase is dispersed and evenly distributed on the matrix, which enhances the strengthening effect of the alloy. The hardness, yield strength, and tensile strength of the alloy are 155.6 HV, 445 MPa, and 484 MPa, respectively. The conductivity and resistivity at this time are 55.2 %IACS and 31.1 nΩ m, respectively. The wear resistance of the alloy is also improved, and the wear depth is decreased. The average friction coefficient is 1.214, and the wear rate is 0.51 × 10−4 mm3/m. The intergranular corrosion depth is 45 µm, the self-corrosion current density is 0.0048 mA cm−2, corrosion weight loss is 8.3 mg/cm2, the passivation film thickness is 1.82 nm, and the corrosion resistance is higher. As the number of cycles continues to increase, the aging time continues to extend, causing the size of the matrix precipitate phase to become coarser, the strengthening effect is weakened, and the properties of the corresponding alloy become degenerate.
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This research was supported by the National Nature Science Foundation of China (52204394).
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Liu, J., Su, R., Shi, L. et al. Effect of Thermal Cold Cycling on the Microstructure and Properties of Al–Cu–Mg–Ag Alloy. Inter Metalcast (2024). https://doi.org/10.1007/s40962-024-01362-0
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DOI: https://doi.org/10.1007/s40962-024-01362-0