CAREER: Understanding of Diffusion and Deformation Mechanisms in Multi-Principal Element Alloy Interlayers for Manufacturing of Multi-Material Structures

在几乎每个制造领域，由于热、物理和化学性质的不匹配，在连接不同材料时都存在挑战。随着组件和系统设计对性能的要求不断提高，以及对先进多材料结构增材制造的兴趣不断增长，这些挑战也在加剧。防止接头界面上有害反应的一种有希望的方法是在两种金属之间放置一个中间层，这可以用来提高延展性并防止基材的化学扩散。该学院早期职业发展计划（Career）奖支持建立一种计算设计方法的研究，以加速层间合金的设计，为控制这些接头的扩散和机械性能的机制提供新的基础知识。这有可能使不同的和以前不兼容的材料连接，同时优化性能，广泛应用于汽车，航空航天和发电行业。该项目还将为接合和先进制造领域的下一代科学家和工程师的教育提供一个平台，重点是基础科学知识，先进的计算技能，实践研究经验和强大的工业参与。据报道，多主元素合金具有优异的力学性能。这项工作将为多主元素合金的热力学、动力学和力学提供重要的见解。该研究计划将调查扩散行为与成分、相稳定性和机械性能之间的关系。本研究将研究具有初级FCC相的多主元素合金的复杂变形机制，使用基于多尺度物理模型和原位高级表征方法来揭示潜在的机制，量化关键参数，并挑战现有理论。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

In almost every manufacturing sector, challenges exist in joining dissimilar materials due to the mismatches in their thermal, physical, and chemical properties. These challenges are exacerbated as component and system designs demand ever-increasing performance, and as interest in additive manufacturing of advanced multi-material structures continues to grow. A promising approach to prevent detrimental reactions at joint interfaces is to place an interlayer between the two metals, which can be used to improve ductility and prevent chemical diffusion of the base materials. This Faculty Early Career Development Program (CAREER) award supports research to establish a computational design methodology to accelerate the interlayer alloy design, providing new fundamental knowledge of the mechanisms that control diffusion and mechanical performance in these joints. This has the potential to enable joining of dissimilar and previously incompatible materials while optimizing performance for a wide range of applications in the automotive, aerospace and power generation industries. This project will also provide a platform for the education of the next generation of scientists and engineers in the field of joining and advanced manufacturing, with a focus on fundamental scientific knowledge, advanced computational skills, hands-on research experiences, and strong industrial engagement.Multi-principal element alloys have been reported to exhibit excellent mechanical properties. This work will provide critical insights to the thermodynamics, kinetics, and mechanics of multi-principal element alloys. The research program will investigate the relationships between diffusion behavior and composition, phase stability, and mechanical performance. Complex deformation mechanisms in multi-principal element alloys with a primary FCC phase will be investigated, using multiscale physics-based models and in-situ advanced characterization methods to reveal the underlying mechanisms, quantify the key parameters, and challenge existing theories.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.