Precipitation processes and structural evolutions of various GPB zones and two types of S phases in a cold-rolled Al-Mg-Cu alloy

Local corrosion mechanism of an Al-Zn-Mg-Cu alloy in oxygenated chloride solution: Cathode activity of quenching-induced η precipitates

It is known that parameters such as deformation together with the temperature and time of aging heat treatment, play critical roles in changing the mechanical properties and the microstructure of AA2024 aluminum alloy. It is shown that a superior level of strength is achievable by applying cold deformation at an appropriate combination of temperature and time. In the present study, the effect of cold deformation on the various properties of artificially aged AA2024 aluminum alloy was assessed. Two cold rolling amounts of 25% and 50% were exerted after solution treatment at 500 °C for 1 h, followed by quenching. The samples were then aged at 180 °C for 2 h, 200 °C for 4 h and 220 °C for 6 h. The microstructure of the samples was examined by Optical microscope, Field Emission Scanning Electron Microscope (FESEM), and High Resolution Transmission Electron Microscope (HRTEM). The Mechanical properties were assessed by tensile and hardness tests. As well, electrical conductivity measurement was used to evaluate the state of precipitation. Results showed that if cold deformation is properly applied, the mechanical properties of the aged samples increase substantially at 180 °C for 2 h. This condition was recognized as the peak aging condition. In a sense, results showed that applying cold deformation would significantly influence on the aging treatment parameters. The cold rolled samples aged at 180 °C for 2 h showed the highest flow stress, but with slightly reduced elongation. Results also showed that aging at 200 °C and 220 °C reduced the strength to the level below the as cold rolled conditions due to the over aging process. High resolution TEM studies confirmed the aged hardening precipitates of the S′ type. Using HRTEM the early stages of these precipitates (i.e. Guinier–Preston–Bagaryatsky (GPB) zone) were explored. The grown state of the S′ precipitates in the form of S (Al2CuMg) type precipitates was also determined in the overaging conditions using the TEM approach. Finally, as an assessment of mechanical properties was performed, taking into account the three parameters of precipitation hardening, recovery and grain growth.

TEM study of S' hardening precipitates in the cold rolled and aged AA2024 aluminum alloy: influence on the microstructural evolution, tensile properties & electrical conductivity

The softening phenomenon of age-hardening aluminum alloy-welded joints is severe during conventional fusion welding, which increases the likelihood of stress and strain concentration in the joint during the period of service, significantly reduces the mechanical properties compared to the base metal, and represents an obstacle to the exploration of the potential structural performance. This review paper focuses on an overview of the softening phenomenon. Firstly, the welding softening mechanism and the characteristics of age-hardening aluminum alloys are clarified. Secondly, the current main research methods that can effectively improve joint softening are summarized into three categories: low-heat-input welding, externally assisted cooling during welding, and post-weld treatment. The strengthening mechanism and performance change rule of age-hardening aluminum alloy joints are systematically analyzed. Finally, this paper considers the future development trends of further research on joint softening, and it is expected that interest in this topic will increase.

Review of Techniques for Improvement of Softening Behavior of Age-Hardening Aluminum Alloy Welded Joints.

Comprehensive improvement of stress corrosion cracking resistance and strength by retrogression and re-aging in Al-8.9Zn-2.6Mg-1.7Cu alloy

The effect of solution-treating temperature of 465–495 °C on the intergranular corrosion (IGC) susceptibility of the peak-aged Al-Zn-Mg-Cu alloy (7050) is investigated. The accelerated corrosion test results show that the IGC susceptibility first decreases and then increases with increasing the solution-treating temperature. Whereas, an opposite change is observed for the Cu content in grain boundary η-Mg(Zn,Cu)2 precipitates based on the quantitative measurement and modeling of grain boundary segregation and precipitation. Furthermore, the change in IGC susceptibility is explained by the electrochemical microcouples between grain boundary η-Mg(Zn,Cu)2 precipitates and precipitation-free zones (PFZs), of which the driving force varies with the Cu content in the η-Mg(Zn,Cu)2 precipitates due to different solution-treating temperatures.

Effect of solution-treating temperature on the intergranular corrosion of a peak-aged Al-Zn-Mg-Cu alloy

Effect of artificial ageing on strength and ductility of an Al-Cu-Mg-Mn alloy subjected to solutionizing and room-temperature rolling

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Effect of solution-treating temperature on the intergranular corrosion of a peak-aged Al-Zn-Mg-Cu alloy

Effect of artificial ageing on strength and ductility of an Al-Cu-Mg-Mn alloy subjected to solutionizing and room-temperature rolling