Akademik Veri Yönetim Sistemi
Journal of Materials Engineering and Performance, 2025 (SCI-Expanded)
AA2524 is primarily utilized in the aircraft industry as a skin material in its heat-treated condition. However, during solution heat treatment, incipient melting may occur, potentially leading to the failure of aircraft components. This study investigates the effects of overheating on the microstructural and mechanical properties of AA2524 by subjecting it to various solution heat treatment temperatures, followed by natural aging. Incipient melting was identified as rosette-shaped eutectic melting in samples solution heat-treated at 510 °C and naturally aged. In addition to rosette-shaped eutectic melting, grain boundary melting was also observed at 520 °C. The incipient melting phase was determined to be Al7Cu2Mg. Differential Scanning Calorimetry (DSC) analysis confirmed that incipient melting initiated at 507 °C. With an increase in solutionizing temperature from 495 to 520 °C, the hardness increased by 6 % and electrical conductivity decreased by 10 %. Conversely, yield strength and tensile strength declined by 26 % and 51 %, respectively, and elongation decreased significantly from 20.1 to 0.6 %. Fatigue tests were conducted at stress levels of 200, 225, 250, and 275 MPa. The fatigue life was reduced by nearly 50% across all stress levels when the solutionizing temperature increased from 495 to 520 °C. The lowest mechanical performance was recorded in specimens treated at 520 °C, where both rosette-shaped and grain boundary melting were simultaneously present. Although fatigue fractures in all samples were primarily initiated by inclusions, intergranular fracture was observed in samples exhibiting grain boundary melting.