Abstract
For next-generation high-performance Al alloys, stress corrosion cracking (SCC) under the combined action of anodic dissolution and hydrogen embrittlement has been a long-standing problem. Herein, a novel SCC-resistant Al alloy design strategy that maintains high strength by optimizing the microstructure and microstress distribution is proposed and developed. Results demonstrated that stress corrosion cracks sprouted and expanded along stress concentration regions. In a T-phase strengthened crossover Al–5.0Mg–4.0Zn alloy, minimal stress concentrations at the grain and phase boundary improved the SCC resistance by high-temperature retrogression and re-aging treatments. Compared with the T6 alloy, the high-temperature retrogression RRA435 °C alloy reduced stress concentration by 36.7% and decreased the diffusion rate of H atoms by 81 folds. The improved SCC resistance was primarily attributed to the reduced diffusion coefficient of hydrogen because of the minimal stress concentrations.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
