|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Mitigation of Stress Corrosion Cracking in Al-Mg via Laser Shock Peening
||Eric Dau, Matthew McMahon
|On-Site Speaker (Planned)
Al-Mg alloys such as AA5083 and AA5456 continue to be utilized in marine construction due to their good weldability and high strength-to-weight ratio. However, sensitization continues to be a challenge at intermediate temperatures due to the high corrosivity of the intergranular β phase, which enables stress corrosion cracking (SCC) and promotes premature failure in service. Previous work demonstrated that laser shock peening (LSP) is a promising residual stress impingement technique that has the ability to mitigate SCC by reducing the effective stress. The present work seeks to further understand the mechanism through which LSP mitigates through-thickness SCC when the compressive residual stress layer only partially penetrates through the material thickness. The incidence of crack tunneling will be evaluated in detail due to the deleterious impact this phenomenon would have on thin aluminum sheet. This evaluation will elucidate the strengths and weaknesses of LSP for SCC mitigation in aggressive seawater exposure.
||Aluminum, Modeling and Simulation, Other