DMREF/Collaborative Research: Grain Interface Functional Design to Create Damage Resistance in Polycrystalline Metallic Materials

DMREF/合作研究：晶粒界面功能设计以提高多晶金属材料的抗损伤能力

• 批准号: 2118673
• 负责人: Siddhartha Pathak
• 金额: $ 48.48万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2118673&HistoricalAwards=false
• 关键词: DMREF; Collaborative; Research; Grain; Interface

Even though polycrystalline metallic materials are ubiquitous in daily life, when and where metallic structural components damage and fail is difficult to predict, which generally leads to overdesign. One form of damage – ductile damage – takes place in materials which are easily plastically deformed by formation of voids and localized shear bands. The initiation of these voids is strongly influenced by the internal constitution of the aggregate composite made up of single crystals comprising the polycrystalline metal. High-purity metals often form voids at the boundaries between single crystals, but it is not known why. This Designing Materials to Revolutionize and Engineer our Future (DMREF) award supports the fundamental study of voids-based ductile damage in high-purity metals to enable the manufacture of materials for specific applications with significantly reduced propensity for void formation. In addition, this project will facilitate collaboration with the Air Force Research Laboratory to pursue design of new materials and manufacturing techniques for strategic purposes. This highly collaborative project will also allow students the opportunity to engage on three campuses, the Air Force Research Laboratory, and a couple of Department of Energy Laboratories to assist in educating the next generation of scientists and engineers in strategically important disciplines. Designing material interfaces to resist formation of voids during tensile deformation will be a significant contribution to the Materials Genome Initiative. This award addresses control of feature and defect character as well as the internal stress state for the design and manufacture of polycrystalline metals against failure. Ductile damage generally includes the processes of void nucleation, growth, and coalescence in addition to localized shear banding. This project is for a new three-dimensional sample design for both rod and plate forms of material, which will be a surrogate for a general structural component for large deformation. High-purity refractory body-centered cubic tantalum is selected as the model material due to its potential for extreme environment use. This material is known to form voids predominantly at grain boundaries and will be the focal point of material design through advanced manufacturing processes. The material design process will include the highly interactive elements of nano, micro and macro-scale experiments at varying strain rates and temperatures, molecular dynamics simulations, thermodynamically consistent plasticity and theory development, micro-scale polycrystal simulations, and macro-scale damage simulations for component design. The highlight of the approach is the uncertainty quantification via machine learning for self-consistent consolidation of large experimental and simulation datasets to guide material design and manufacturing process. The goal of this project is to design a manufacturing process to produce material which reduces damage by 30% over that in the as-received and annealed state.This project is jointly funded by the Division of Civil, Mechanical and Manufacturing Innovation (CMMI) in the Directorate for Engineering (ENG), the Divisions of Materials Research (DMR) and Mathematical Sciences (DMS) in the Directorate for Mathematical and Physical Sciences (MPS), and the Established Program to Stimulate Competitive Research (EPSCoR).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.

即使多晶金属材料在日常生活中无处不在，但金属结构成分的何时何地损害和失败很难预测，这通常会导致过度设计。一种损坏的形式 - 延性损伤 - 发生在材料中，这些材料很容易通过空隙和局部剪切带形成塑性变形。这些空隙的主动性受到由单晶体高纯度金属组成的聚集体的内部构型的强烈影响，通常在单晶之间的边界形成空隙，但尚不知道为什么。这种设计材料彻底改变和设计我们的未来（DMREF）奖，支持了对高纯度金属中基于空隙的延性损害的基本研究，以使制造特定应用的材料，并大大降低了空隙形成的承诺。此外，该项目将促进与空军研究实验室的合作，以购买新材料和制造技术的设计，以进行战略目的。这个高度协作的项目还将使学生有机会在三个校园，空军研究实验室和几个能源实验室参与其中，以协助教育下一代科学家和工程师在战略上重要的学科中。设计材料界面以抵抗拉伸变形过程中的空隙形成将是对材料基因组倡议的重要贡献。该奖项旨在解决特征和缺陷特征的控制以及用于设计和制造多晶金属反对故障的内部应力状态。延性损伤通常还包括除局部剪切带外的空隙成核，生长和聚结的过程。该项目是针对杆和板材料板形式的新的三维样品设计，这将是用于大变形的一般结构成分的替代物。高纯度耐火疗法以身体为中心的立方塔塔勒姆被选择作为模型材料，因为它可能会使用极端环境。已知该材料主要在晶界形成空隙，并且将是通过先进的制造过程的材料设计的焦点。材料设计过程将包括纳米，微观和宏观尺度实验的高度交互性元素以不同的应变速率进行，方法的亮点是通过机器学习进行不确定性定量，以自谐固结大型实验和仿真数据集，以指导材料设计和制造过程。该项目的目的是设计制造过程，以生产减少损坏的材料。 by 30% over that in the as-received and annealed state.This project is jointly funded by the Division of Civil, Mechanical and Manufacturing Innovation (CMMI) in the Directorate for Engineering (ENG), the Divisions of Materials Research (DMR) and Mathematical Sciences (DMS) in the Directorate for Mathematical and Physical Sciences (MPS), and the Established Program to Stimulate Competitive Research (EPSCoR).This award reflects NSF的法定使命，并使用基金会的知识分子优点和更广泛的审查标准来评估，被认为是宝贵的支持。