Study on the effect of aging treatment on the mechanical properties of the die-forged Al-Cu-Mg-Ag heat-resistant alloy

• Published in: Journal of physics. Conference series 2023-08, Vol.2566 (1), p.12026
• Main Authors: Chen, Lifang, Zhu, Kai, Liu, Qilong, Lin, Haitao, Wang, Zhengan, Liu, Hongwei
• Format: Article
• Language: English
• Subjects: Aging; Aging (metallurgy); Alloys; Aluminum base alloys; Copper; Copper base alloys; Deformation; Electron back scatter; Forgings; Heat resistant alloys; Heat treatment; Magnesium; Mechanical properties; Microscopy; Microstructure; Optical microscopy; Optimization; Physics; Silver base alloys
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2566/1/012026

In this research, the microstructure of large industrial Al-Cu-Mg-Ag alloy die-forgings at key load-bearing locations was examined using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and electron back-scattered diffraction (EBSD). Also, the impact of various age treatment methods on the mechanical characteristics of die-forged Al-Cu-Mg-Ag alloys was investigated. The findings indicate that deformed grains predominate in this alloy’s grain type at this site. The microstructure of the alloy exhibits distinct forging flow lines, according to the results of color metallographic characterization. In the direction of matrix deformation, the alloy’s second-phase particle distribution is streamlined. The peak aging time of the alloy gradually shortens as the temperature of the aging treatment rises. The mechanical characteristics of the alloy first show a rising trend at various aging treatment temperatures, followed by a steady fall as the aging duration is extended. For this forged aluminum alloy, optimization suggests that the ideal single-stage aging heat treatment regime is 165°C/20h.