CAREER: Solute Effects on the Oxidation Behavior of Ni Alloys

该职业奖支持一项综合教育和研究计划，重点关注学生的外展，动机和创造性思维，目标是在物理冶金，材料环境降解和最先进的显微镜领域的研究和教学方面取得卓越成就。在结构材料领域，特别是发电应用领域，不仅需要对结构材料的内在特性进行关键研究，例如强度、韧性或蠕变，而且更重要的是对外部环境的外在响应。提出的理念是在原子尺度上解开和量化控制材料特性的机制，并将这些信息纳入合金设计“规则”。关注目前用于解释稀土元素作用的动态偏析理论，硅在形成连续氧化保护层中的可能作用，以及热力学和动力学在定义“第三元素效应”时的竞争性质，建议使用高空间和化学分辨率表征技术与理论建模相结合，将提供定量信息，以回答关于合金作用的长期悬而未决的问题。这种新的理解对于验证计算模型和基于材料基因组计划设想的新合金设计方法以更有效的方式设计抗氧化材料至关重要。环境退化无处不在；因此，方法、概念和培训可以转化为更大范围的材料科学或材料工程问题，从生物植入物到能源生产、能量转换和运输用轻合金。通过与纽约大都会博物馆和法国历史纪念碑实验室的合作，拟议的教学和额外的研究经验将扩大科学范围，通过影响其他材料领域的氧化和腐蚀问题，同时为项目增加文化成分。该计划将促进招募代表性不足的少数民族，特别是妇女参与研究活动。随着开放式网络教学和研究工具的发展，令人兴奋的合作研究、教学和推广活动在各级教育领域将为学生、专业人士和同事提供独特的机会，在多样化的环境中在自己的研究努力中脱颖而出，同时激发持续的推广思维。该职业奖支持一项综合教育和研究计划，重点关注学生的外展，动机和创造性思维，目标是在物理冶金，材料环境降解和最先进的显微镜领域的研究和教学方面取得卓越成就。在结构材料领域，特别是发电应用领域，不仅需要对结构材料的内在特性进行关键研究，例如强度、韧性或蠕变，而且更重要的是对外部环境的外在响应。特定合金元素对模型Ni-Al合金氧化反应的影响将通过直接成像技术进行研究，该技术允许以近原子分辨率可视化结构和化学反应。结合理论建模，这种方法将提供回答金属氧化领域长期开放问题所需的定量信息。环境退化无处不在；因此，研究方法、概念和培训可以应用于更大范围的材料科学或材料工程问题，从生物植入物到能源生产、能源转换和运输用轻合金。通过与纽约大都会博物馆和法国历史纪念碑实验室的合作，拟议的教学和额外的研究经验将通过影响氧化和腐蚀问题显著的其他材料领域来扩大项目的科学范围。该计划将促进招募代表性不足的少数民族，特别是妇女参与研究活动。令人兴奋的合作研究，教学和推广活动在各级教育范围和开放的网络教学和研究工具的发展将为学生，专业人士和同事提供独特的机会，在不同的环境中，在自己的研究努力中脱颖而出，同时激发持续的推广思维。

Technical SummaryThis CAREER award supports an integrated educational and research plan focusing on student outreach, motivation, and creative thinking with goals of excellence in research and teaching in the field of physical metallurgy, environmental degradation of materials, and state-of-the-art microscopy. In the area of structural materials particularly for power generation applications, critical research is needed not merely on the intrinsic properties of structural materials, e.g. strength, toughness, or creep, but more significantly on the extrinsic response to external environments. The proposed philosophy is to unravel and quantify the mechanisms that controls materials properties at the atomic scale and to incorporate this information into alloy design "rules". Focusing on the dynamic segregation theory currently used for explaining the role of rare earth elements, the possible role of Si in the creation of a continuous oxide protective layer, and the competitive nature of thermodynamics and kinetics in defining the "third element effect", the proposed use of high spatial and chemical resolution characterization techniques in combination with theoretical modeling will provide quantitative information needed to answer long-standing open questions on the role of alloying. This new understanding is critically important for validation of computational models and use in design of oxidation resistant materials in a more efficient manner based on new alloy design approaches envisioned in the Materials Genome Initiative.Environmental degradation is ubiquitous; therefore methods, concepts, and training are translatable to a much larger range of materials science or materials engineering issues, from bio-implants to energy production, energy conversion, and light alloys for transportation. Through collaborations with the New York Metropolitan Museum and the French Laboratoire des Monuments Historiques, the proposed teaching and additional research experiences will broaden the scientific scope, by impacting other materials areas where oxidation and corrosion issues are significant, while adding a cultural component to the project. The program will foster the recruitment of under-represented minorities and women in particular into research activities. The exciting collaborative research, teaching, and outreach activities at all levels of the educational spectrum along with the development of open web-based teaching and research tools will provide students, professionals, and colleagues with unique opportunities to excel in their own research endeavors within a diverse setting while inspiring a sustained outreach mindset.Non-technical summaryThis CAREER award supports an integrated educational and research plan focusing on student outreach, motivation, and creative thinking with goals of excellence in research and teaching in the field of physical metallurgy, environmental degradation of materials, and state-of-the-art microscopy. In the area of structural materials particularly for power generation applications, critical research is needed not merely on the intrinsic properties of structural materials, e.g. strength, toughness, or creep, but more significantly on the extrinsic response to external environments. The effects of specific alloying elements on the oxidation response of model Ni-Al alloys will be investigated through direct imaging techniques allowing structures and chemistry to be visualized with near atomic resolution. In combination with theoretical modeling, this approach will provide quantitative information needed to answer long-standing open questions in the field of metal oxidation. Environmental degradation is ubiquitous; therefore investigation methods, concepts, and training are translatable to a much larger range of materials science or materials engineering issues, from bio-implants to energy production, energy conversion, and light alloys for transportation. Through collaborations with the New York Metropolitan Museum and the French Laboratoire des Monuments Historiques, the proposed teaching and additional research experiences will broaden the scientific scope of the project, by impacting other materials areas where oxidation and corrosion issues are significant. The program will foster the recruitment of under-represented minorities and women in particular into research activities. The exciting collaborative research, teaching and outreach activities at all levels of the educational spectrum and the development of open web-based teaching and research tools will provide students, professionals, and colleagues with unique opportunities to excel in their own research endeavors within a diverse setting while inspiring a sustained outreach mindset.