Ever more stringent regulations on greenhouse gas emissions from transportation motivate efforts to revisit materials used for vehicles. High-strength Al-alloys often used in aircrafts could help reduce the weight of automobiles, but are susceptible to environmental degradation. Hydrogen (H) "embrittlement" is often pointed as the main culprit, however, the mechanisms underpinning failure are elusive: atomic-scale analysis of H inside an alloy remains a challenge, and this prevents deploying alloy design strategies to enhance the materials' durability. Here we successfully 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 show that the co-segregation of alloying elements and H favours grain boundary decohesion, while the strong partitioning of H into the second-phases 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 retarding cracking and guiding new alloy design.
Transforming Acidic Corrosion and Embrittlement into a Hydrogen-Trapping Cage
State Key Laboratory of High Pressure and Superhard Materials, Synergetic Extreme Condition High-Pressure Science Center, College of Physics, Jilin University（吉林大学物理学院高压与超硬材料国家重点实验室协同极端条件高压科学中心）；Key Laboratory of Material Simulation Methods and Software of Ministry of Education, College of Physics, Jilin University（吉林大学物理学院教育部材料模拟方法与软件重点实验室）；State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University（西安交通大学材料行为力学国家重点实验室）；Spallation Neutron Source Science Center, Institute of High Energy Physics, Chinese Academy of Sciences (CAS)（中国科学院高能物理研究所散裂中子源科学中心）；Key Laboratory of Functional Materials and Devices for Informatics of Anhui Educational Institutions, Fuyang Normal University（阜阳师范大学安徽省教育信息化功能材料与器件重点实验室）；Department of Physics, College of Science, Yanbian University（延边大学理学院物理系）
Element-Specific Solute Trapping and Grain Structure Evolution during Laser Powder Bed Fusion of Multicomponent Alloys
University of Michigan, Dearborn（密歇根大学迪尔伯恩分校）；Texas A&M University（德克萨斯农工大学）；AlphaSTAR Technology Solutions（AlphaSTAR技术解决方案）；University of Michigan, Ann Arbor（密歇根大学安娜堡分校）
Atomistic understanding of hydrogen bubble-induced embrittlement in tungsten enabled by machine learning molecular dynamics
University of Science and Technology Beijing（北京科技大学）；Fuzhou University（福州大学）；Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing（北京科技大学材料基因组工程高等创新中心）；Aalto University（阿尔托大学）；Tel Aviv University（特拉维夫大学）
Monitoring Gallium-Induced Damage in Aluminum Alloys Using Nonlinear Resonant Ultrasound Spectroscopy
Institute of Thermomechanics, Czech Academy of Sciences（捷克科学院热力学研究所）；Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague（布拉格捷克理工大学核科学与物理工程学院）；DISAT, Condensed Matter Physics and Complex Systems Institute, Politecnico di Torino（都灵理工大学生化与物理技术系凝聚态物理与复杂系统研究所）
在这项研究中，我们已经纳入了两个时间尺度的相场晶体模型的二元合金，探索不同的溶质捕获性能作为晶体-熔体界面速度的函数。只有扩散动力学，我们证明了偏析系数，K作为一个二元合金的速度的函数是一致的卡普兰和阿齐兹的模型，其中K接近统一的极限的无限速度。然而，随着在密度场和浓度场中引入波动动力学，捕获遵循S。Sobolev[Phys. Rev. A. 199：383386，1995.]，其中完全捕获以有限速度发生。
A computational alloy design framework for the promotion of amorphous grain boundary complexions
Hopkins Extreme Materials Institute, Johns Hopkins University（约翰斯·霍普金斯大学极端材料研究所）；Department of Materials Science and Engineering, Johns Hopkins University（约翰斯·霍普金斯大学材料科学与工程系）；Department of Materials Science and Engineering, University of California Los Angeles（加州大学洛杉矶分校材料科学与工程系）；Department of Mechanical and Aerospace Engineering, University of California Los Angeles（加州大学洛杉矶分校机械与航空航天工程系）；Department of Materials Science and Chemical Engineering, Stony Brook University（石溪大学材料科学与化学工程系）；Institute for Advanced Computational Science, Stony Brook University（石溪大学高级计算科学研究所）；Materials Science and Technology Division, Oak Ridge National Laboratory（橡树岭国家实验室材料科学与技术部）
Hydrogen segregation around a straight screw dislocation in bcc iron
Laboratoire des Sciences de l’Ingénieur pour l’Environnement (LaSIE) - UMR CNRS 7356（环境工程科学实验室）；Laboratoire des Sciences des Procédés et des Matériaux (LSPM) - UPR 3407（工艺与材料科学实验室）
Leakage-Safe Machine Learning for Hydrogen Embrittlement Detection in 316L Stainless Steel: A Region-Held-Out Evaluation of Texture and Deep Features in SEM Micrographs
Institute of Physics, Bahauddin Zakariya University（巴哈丁·扎卡里亚大学物理研究所）
University of California, Irvine（加州大学尔湾分校）；University of New Mexico（新墨西哥大学）；Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院）；Massachusetts Institute of Technology（麻省理工学院）；University of California, San Diego（加州大学圣地亚哥分校）；Johns Hopkins University（约翰斯·霍普金斯大学）；Stony Brook University（石溪大学）；University of Arizona（亚利桑那大学）；Los Alamos National Lab（洛斯阿拉莫斯国家实验室）；University of Tennessee, Knoxville（田纳西大学诺克斯维尔分校）
