Understanding Surface Reactivity of Bimetallic Alloys

了解双金属合金的表面反应性

• 批准号: 1905647
• 负责人: Brian Gleeson
• 金额: $ 37.45万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-10-01 至 2022-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905647&HistoricalAwards=false
• 关键词: Understanding; Surface; Reactivity; Bimetallic; Alloys

Corrosion is a crucial concern in applications involving metals, such as nuclear reactor vessels, pipelines, ship hulls, jet engine turbines blades, bio-metallic implants, and bridges. A longstanding challenge in corrosion science is the need to predict accurately the degradation of a given alloy or coating based on its composition and the exposure conditions. The formation of a protective oxide scale layer is a common mechanism by which metals achieve corrosion resistance, but the formation of these scales is not well understood. Factors such as chemistry, surface conditions, and material sensitivity control oxidation behavior, but classical oxidation models lack the ability to predict whether a given alloy composition can form a continuous protective scale for a specific service environment. A primary reason for this gap in knowledge is the lack of experimental tools capable of observing the earliest stages of oxidation. This award supports the fundamental research into the atomic- and nano-scale process of alloy oxidation needed to develop practical, predictive models. The scientific understanding will accelerate materials innovations relevant to many technological areas that require sustained corrosion resistance at elevated temperatures, including energy generation, materials processing, and chemical conversion processes. This research program will contribute to national economic competitiveness through the development of novel materials and technologies, and to the development of a competitive STEM workforce through training and mentorship of graduate students and postdocs, interdisciplinary courses, and an emphasis on the participation of women and underrepresented minorities.The evolutionary processes leading to the establishment of protective oxide scales during corrosion are critically important but depend on many intrinsic and extrinsic variables, including temperature, total pressure, nature and abundance of the reacting species, structural and chemical factors, and competitive nucleation and interfacial phenomena. This research will systematically assess the relationships among these variables to develop a detailed understanding of the establishment of protective scale formation in harsh environments including environments of high temperature and multiple oxidizing gases. The metal oxide nucleation and growth will be visualized at the atomic level using in situ environmental transmission electron microscopy. The growth kinetics and structure of the scales that eventually form will be characterized using thermal gravimetric analysis and a variety of electron microscopy techniques. These key experimental efforts, enhanced by complementary theoretical calculations, will explicate the atomic origins and critical parameters affecting the reaction pathways of protective oxide-scale formation in service-relevant environments. This combination of in situ and ex situ characterizations bridges large temporal- and spatial-scale ranges, from initial-stage oxidation to the development of the thermodynamically stable oxide. The knowledge resulting from the methodologies developed will lead to new paradigms in this important field of gas-solid surface reactions.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.

在涉及金属的应用中，腐蚀是一个至关重要的问题，例如核反应堆容器、管道、船体、喷气发动机涡轮叶片、生物金属植入物和桥梁。腐蚀科学中的一个长期挑战是需要根据其成分和暴露条件准确预测给定合金或涂层的降解。 形成保护性氧化皮层是金属实现耐腐蚀性的常见机制，但这些氧化皮的形成并不清楚。化学、表面条件和材料敏感性等因素控制氧化行为，但经典氧化模型缺乏预测给定合金成分是否能在特定使用环境下形成连续保护氧化皮的能力。造成这种知识差距的主要原因是缺乏能够观察氧化最早阶段的实验工具。该奖项支持开发实用的预测模型所需的原子和纳米级合金氧化过程的基础研究。科学的理解将加速与许多技术领域相关的材料创新，这些技术领域需要在高温下保持耐腐蚀性，包括能源生产，材料加工和化学转化过程。该研究计划将通过开发新材料和新技术，促进国家经济竞争力，并通过培养和指导研究生和博士后，跨学科课程，以及强调妇女和代表性不足的少数民族的参与。腐蚀过程中导致保护性氧化皮建立的进化过程至关重要但取决于许多内在和外在变量，包括温度、总压力、反应物质的性质和丰度、结构和化学因素以及竞争成核和界面现象。本研究将系统地评估这些变量之间的关系，以详细了解在高温和多种氧化性气体环境等恶劣环境中保护性结垢的形成。金属氧化物的成核和生长将在原子水平上使用原位环境透射电子显微镜可视化。最终形成的鳞片的生长动力学和结构将使用热重分析和各种电子显微镜技术进行表征。这些关键的实验工作，增强了互补的理论计算，将阐明原子的起源和关键参数影响的反应途径的保护氧化物规模形成在服务相关的环境。这种原位和非原位表征的组合桥接了大的时间和空间尺度范围，从初始阶段的氧化到结晶稳定的氧化物的发展。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知识价值和更广泛的影响审查标准进行评估来支持。

项目成果

In situ ETEM study of surface reconstruction formation on stepped Cu surfaces during oxidation

氧化过程中阶梯铜表面表面重构形成的原位 ETEM 研究

• DOI: 10.1017/s1431927621008096
• 发表时间: 2021
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Li, Meng;Curnan, Matthew;Garza, Richard;House, Stephen;Saidi, Wissam;Yang, Judith
• 通讯作者: Yang, Judith

Dislocation-induced stop-and-go kinetics of interfacial transformations

位错引起的界面转变的停走动力学

• DOI: 10.1038/s41586-022-04880-1
• 发表时间: 2022
• 期刊: Nature
• 影响因子: 64.8
• 作者: Sun, Xianhu;Wu, Dongxiang;Zou, Lianfeng;House, Stephen D.;Chen, Xiaobo;Li, Meng;Zakharov, Dmitri N.;Yang, Judith C.;Zhou, Guangwen
• 通讯作者: Zhou, Guangwen

Probing the Cation Distribution in Gamma-alumina Enabled by O-K Edge Artifact Suppression Using Cryo-EELS

使用 Cryo-EELS 探测通过 O-K 边缘伪影抑制实现的 γ-氧化铝中的阳离子分布

• DOI: 10.1017/s1431927620021996
• 发表时间: 2020
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Ayoola, Henry;Li, Cheng-Han;House, Stephen;Kas, Joshua;Rehr, John;Jinschek, Joerg;Saidi, Wissam;Yang, Judith;Bonifacio, Cecile
• 通讯作者: Bonifacio, Cecile

Quantifying Atomic Scale Oxidation Dynamics of Cu Using In situ ETEM and Advanced Data Analysis

使用原位 ETEM 和高级数据分析量化 Cu 的原子尺度氧化动力学

• DOI: 10.1017/s1431927622001519
• 发表时间: 2022
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Li, Meng;Curnan, Matthew T.;Garza, Richard Burke;House, Stephen D.;Saidi, Wissam A.;Yang, Judith C.
• 通讯作者: Yang, Judith C.

In-situ ETEM observation of intergranular oxidation of copper

铜晶间氧化的原位ETEM观察

• DOI: 10.1017/s1431927621004888
• 发表时间: 2021
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Sun, Xianhu;Garza, Richard;Chen, Xiaobo;Li, Meng;House, Stephen;Saidi, Wissam;Yang, Judith;Zhou, Guangwen
• 通讯作者: Zhou, Guangwen