文献类型：期刊文献

英文题名：Hydrogen trapping and embrittlement in high-strength Al alloys

作者：Zhao, Huan[1];Chakraborty, Poulami[1];Ponge, Dirk[1];Hickel, Tilmann[1,2];Sun, Binhan[1,3];Wu, Chun-Hung[1];Gault, Baptiste[1,4];Raabe, Dierk[1]

机构：[1]Max Planck Inst Eisenforsch GmbH, Dusseldorf, Germany;[2]BAM Fed Inst Mat Res & Testing, Berlin, Germany;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai, Peoples R China;[4]Imperial Coll London, Royal Sch Mines, Dept Mat, London, England

年份：2022

卷号：602

期号：7897

起止页码：437

外文期刊名：NATURE

收录：;EI(收录号：20220011718);WOS:【SCI-EXPANDED(收录号:WOS:000756892700013)】；

基金：We acknowledge A. Sturm for technical support with cryo-experiments in the PFIB and cryo-suitcase transfer in the atom probe. The help of L.Stephenson for the cryo-transfer in the atom probe is also appreciated. We are grateful to D.Wan for the initial TDS measurements, and M.Adamek for the tensile experiments. B.G. acknowledges financial support from the ERC-CoG-SHINE-771602. Plane vector image in Fig. 1 was obtained from https://freesvg.org/plane-vector-image (public domain).

语种：英文

外文关键词：Alloying elements - Aluminum alloys - Calculations - Gas emissions - Greenhouse gases - High strength alloys - Materials handling - Statistics

摘要：Ever more stringent regulations on greenhouse gas emissions from transportation motivate effortsto revisit materials used for vehicles(1). High-strength aluminium alloys often used in aircrafts could help reduce the weight of automobiles, but are susceptible to environmental degradation(2,3). Hydrogen 'embrittlement' is often indicated as the main culprit(4): however, the exact mechanisms underpinning failure are not precisely known: atomic-scale analysis of H inside an alloy remains a challenge, and this prevents deploying alloy design strategiesto enhance the durability of the materials. Here we performed near-atomic-scale analysis of H trapped in second-phase particles and at grain boundaries in a high-strength 7xxx Al alloy. We used these observations to guide atomistic ab initio calculations, which showthat the co-segregation of alloying elements and H favours grain boundary decohesion, and the strong partitioning of H into the second-phase particles removes solute H from the matrix, hence preventing H embrittlement. Our insights further advance the mechanistic understanding of H-assisted embrittlement in Al alloys, emphasizing the role of H traps in minimizing cracking and guiding new alloy design.