DMREF: Engineering Strength and Toughness into Metals

结构材料的两个最重要的特性是它们的强度和延展性——承受变形而不断裂的能力。高强度要求结构部件能够承受高载荷，而良好的延展性对于避免在承载应用中发生灾难性破坏至关重要。该设计材料变革和工程我们的未来（DMREF）奖通过建立金属强化和增韧机制框架，支持基础研究，以设计金属的强度和韧性。该研究计划将在微观尺度上研究结构金属变形的基本机制，并将这些机制与这些材料的性能联系起来。这项研究涉及加州大学戴维斯分校、佐治亚理工学院和洛斯阿拉莫斯国家实验室之间的合作，采用包括实验、建模和模拟以及诊断在内的协同方法。这项研究将通过建立一个知识库来设计具有特定强度和韧性组合的材料，从而加速材料的发现。DMREF研究的目标是设计双网格。假设这些网格可以同时通过引入高密度的防滑屏障来增强强度，通过裂纹偏转和钝化来增强韧性，通过联锁网络的性质来保持微观结构的稳定性，以及由于其三维结构而具有的这些优越性能的各向同性。从本研究中获得的结果将有助于制定设计双网格所需的科学框架，并实施实验研究，以获取改进物理模型和增强模型预测的数据。最终，该研究计划的策略是建立一种原始的协同实验建模方法，该方法可以通过“双网格工程”的新概念实现金属的强度和韧性。

Two of the most important properties of structural materials are their strength and their ductility - the ability to withstand deformation without breaking. High strength is desired for structural components so that they can carry high loads, and a good ductility is essential to avoid catastrophic failure in load-bearing applications. This Designing Materials to Revolutionize and Engineer our Future (DMREF) award supports fundamental research to engineer strength and toughness into metals, by establishing a framework of strengthening and toughening mechanisms in metals. The research program will investigate fundamental mechanisms of deformation in structural metals at the microscopic scale, and relate these to the performance of these materials. This research involves collaborations between the University of California at Davis, Georgia Institute of Technology and Los Alamos National Laboratories, with a synergistic approach encompassing experimentation, modeling and simulation, and diagnostics. This research will accelerate materials discovery by building a knowledge base to design materials that have specific combinations of strength and toughness.The goal of this DMREF research is to engineer twin-twin meshes. The hypothesis is that these meshes can simultaneously impart strength by introducing a high density of barriers to slip, toughness by crack deflection and blunting, microstructural stability by nature of an interlocking network, and isotropy in these superior properties due to their three-dimensional configuration. Results obtained from this research will help formulate the scientific framework required to design twin meshes and to implement experimental studies to acquire data for refinement of physical models and enhancement of model predictions. Ultimately, the strategy of this research program is to establish an original synergistic experimental-modeling approach, which can be implemented to engineer strength and toughness into metals via the novel concept of "twin mesh engineering."