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Fundamental Insights into Multi-element Grain Boundary Segregation in Nanocrystalline Alloys

纳米晶合金中多元素晶界偏析的基本见解

基本信息

批准号：
2114832
负责人：
Fadi Abdeljawad
金额：
$ 25.79万
依托单位：
Clemson University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-01 至 2023-10-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2114832&HistoricalAwards=false
关键词：
Fundamental Insights into Multi element

项目摘要

NONTECHNICAL SUMMARYThis award supports research and educational activities aimed at gaining fundamental insights into the segregation of multiple elemental species to grain boundaries, and how it affects grain growth in nanocrystalline metallic alloys. Nearly all functional and structural materials are polycrystalline systems; they are composed of differently oriented crystalline grains that are joined at internal interfaces, termed grain boundaries. The grain size and distribution in a metal greatly influences many engineering properties, including mechanical, thermal, and electrical. For example, the mechanical strength of a metal increases rapidly with decreasing grain size. However, due to their small grain size and high density of grain boundaries, nanocrystalline materials are usually structurally unstable. As a result, they undergo rapid grain growth, which limits their use in many technological applications. In this project, the PI will investigate the segregation of multiple types of elemental species to grain boundaries and its role in grain growth in multi-component alloys. The research involves theoretical development and numerical implementation of mathematical models that will be used to simulate the dynamics of grain boundary segregation and grain growth kinetics. A primary focus of this project will be on metallic alloys composed of three different types of elements. Lying at the intersection of materials science and applied mathematics, this project will impact numerous areas of materials physics, chemical thermodynamics, and nanotechnology. Further, this project will provide an avenue to train future-generation of engineers and scientists with the skill set necessary for careers in knowledge-intensive industries in South Carolina, which is an emerging technology and manufacturing hub. The PI will design an “Atomic Legos” outreach activity to engage K-12 students in materials science and help them learn about crystals and metals. This project leverages Clemson’s “Creative Inquiry” program in order to involve undergraduate students, particularly women and underrepresented groups, in scientific research.TECHNICAL SUMMARYThis award supports the development of a mesoscale theoretical and computational modeling framework aimed at advancing our fundamental understanding of the segregation of multiple types of elemental species to grain boundaries and its role in grain growth and thermal stability of nanocrystalline metallic alloys. Owing to their nanoscale grain size, nanocrystalline materials exhibit a unique combination and properties and functionalities. However, rampant grain growth during materials processing or under service conditions is considered one of the main hurdles to the large-scale use of nanocrystalline metals in many engineering technologies. In this project, the PI aims to elucidate key multi-element grain boundary segregation mechanisms that control grain boundary migration and grain growth in metallic alloys. Specific goals of this project include: (1) Development of a theoretical and computational phase field model of multi-element grain boundary segregation in multi-component alloys that accounts for bulk and interface thermodynamics and is able to simulate the microstructural evolution over diffusive scales; (2) Perform theoretical analysis and computational studies to quantify the thermodynamic and kinetic effects of multi-element grain boundary segregation on the thermal stability of nanocrystalline alloys; (3) Quantify the role of the grain boundary network effect in solute partitioning and distribution within grain microstructures. Lying at the intersection of materials science and applied mathematics, this project will impact numerous areas of materials physics, chemical thermodynamics, and nanotechnology. Further, this project will provide an avenue to train future-generation of engineers and scientists with the skill set necessary for careers in knowledge-intensive industries in South Carolina, which is an emerging technology and manufacturing hub. The PI will design an “Atomic Legos” outreach activity to engage K-12 students in materials science and help them learn about crystals and metals. This project leverages Clemson’s “Creative Inquiry” program in order to involve undergraduate students, particularly women and underrepresented groups, in scientific research.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.

非技术性总结该奖项支持旨在获得多个元素物种到晶界的偏析的基本见解的研究和教育活动，以及它如何影响纳米晶金属合金中的晶粒生长。几乎所有的功能和结构材料都是多晶系统;它们由不同取向的晶粒组成，这些晶粒在内部界面处连接，称为晶界。金属中的晶粒尺寸和分布极大地影响许多工程性质，包括机械、热和电。例如，金属的机械强度随着晶粒尺寸的减小而迅速增加。然而，由于其晶粒尺寸小和晶界密度高，纳米晶材料通常结构不稳定。因此，它们经历快速的晶粒生长，这限制了它们在许多技术应用中的使用。在这个项目中，PI将研究多种类型的元素物种在晶界上的偏析及其在多组分合金晶粒生长中的作用。该研究涉及理论发展和数学模型的数值实现，将用于模拟晶界偏析和晶粒生长动力学的动态。该项目的主要重点将是由三种不同类型的元素组成的金属合金。位于材料科学和应用数学的交叉点，该项目将影响材料物理，化学热力学和纳米技术的许多领域。此外，该项目将提供一个途径，以培养未来一代的工程师和科学家的技能，在南卡罗来纳州，这是一个新兴的技术和制造业中心的知识密集型产业的职业生涯。PI将设计一个“原子乐高”外展活动，让K-12学生参与材料科学，并帮助他们了解晶体和金属。这个项目利用了克莱姆森的“创造性探究”项目，以吸引本科生，特别是女性和代表性不足的群体，该奖项支持发展一个中尺度的理论和计算建模框架，旨在推进我们对多种类型的元素物种在晶界上的分离及其在晶粒生长和热稳定性中的作用的基本理解。纳米晶金属合金由于其纳米级晶粒尺寸，纳米晶材料表现出独特的组合、性质和功能。然而，在材料加工过程中或在服务条件下的猖獗的晶粒生长被认为是在许多工程技术中大规模使用纳米晶金属的主要障碍之一。在这个项目中，PI旨在阐明控制金属合金中晶界迁移和晶粒生长的关键多元素晶界偏析机制。本项目的具体目标包括：（1）建立多组元合金中多元素晶界偏聚的理论和计算相场模型，该模型考虑了块体和界面热力学，能够模拟扩散尺度上的微观组织演变;（2）进行理论分析和计算研究，以量化多个元素晶界偏聚对纳米晶合金热稳定性的影响;（3）定量分析晶界网络效应对溶质在晶粒内分配和分布的作用。位于材料科学和应用数学的交叉点，该项目将影响材料物理，化学热力学和纳米技术的许多领域。此外，该项目将提供一个途径，以培养未来一代的工程师和科学家的技能，在南卡罗来纳州，这是一个新兴的技术和制造业中心的知识密集型产业的职业生涯。PI将设计一个“原子乐高”外展活动，让K-12学生参与材料科学，并帮助他们了解晶体和金属。该项目利用了克莱姆森的“创造性探究”计划，以使本科生，特别是妇女和代表性不足的群体，参与科学研究。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估来支持。