GOALI: Dynamics of Layered, Multifunctional Systems with Evolving Structure

GOALI：具有演化结构的分层多功能系统的动力学

• 批准号: 0605700
• 负责人: Carlos Levi
• 金额: $ 220.82万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0605700&HistoricalAwards=false
• 关键词: GOALI; Dynamics; Layered; Multifunctional; Systems

NON-TECHNICAL DESCRIPTION: An interdisciplinary academic/industry team has been convened to perform research on fundamental aspects of layered multifunctional systems used for the thermal and environmental protection of gas turbine components. These material systems offer quantum-leap improvements in engine efficiency with attendant benefits to the economics and environmental impact of the national energy and transportation sectors, as well as to the global competitiveness of the US industry. Fulfillment of this promise is currently hindered by inadequate understanding of how these multi-material non-equilibrium systems evolve over time upon exposure to one of the harshest environments encountered in modern technology. The research team aims to advance this understanding by focusing on the fundamental connections between the chemistry, internal structure and morphology of the layers and interfaces, their evolution over time, the impact on properties and the relevance to mechanisms that eventually compromise the integrity of the system and lead to failure. The program provides unique educational opportunities by (i) motivating students to learn the scientific foundation of their discipline within the context of a technologically important problem, (ii) working as members of an interdisciplinary team that includes scientists from a world leading company in this area (General Electric) collaborating with academics with diverse background and expertise, and (iii) having access to internships at a premier corporate research center (GE-Global Research). As research becomes increasingly global, it is deemed invaluable for students to have experiences in doing research abroad. This program offers such opportunities at collaborating institutions in Europe, Latin America and Pacific Rim countries, including GE-GRC in Bangalore. The program will benefit from the excellent outreach infrastructure of the participating universities, and the proven record of the investigators involving undergraduates and members of underrepresented groups in their research. The fundamental nature of the program, its prospective impact on a technology of critical importance to the US economy, and the educational enrichment experiences available to students are fully consistent with the goals of NSF and its sponsoring programs.TECHNICAL DETAILS: The overarching objective of this program is to develop a fundamental understanding of the dynamics of structure evolution in layered systems subject to the extreme environments typical of gas turbine engines, and how these influence system performance. Establishing the fundamentals governing the physico-chemical phenomena within and between layers will enable the design of improved protection concepts for next generation turbine systems that operate at higher temperature. The information generated will also facilitate validation and refinement of system-level models used for design and durability assessments. The research aims to distil phenomena having crucial impact on a technologically important system by integrating component/layer functionalities with the evolutionary processes that lead to their degradation. Because of the complexity of the system and the scale of the layers, new high-resolution probes occupy a central role. Scientific advances are envisaged within the following five themes. (a) Phase evolution in refractory oxides caused by the decomposition of metastable phases and of clustering in multi-doped systems. (b) Surface diffusion in oxides, including its dependence on dopants, and its effects on the sintering of textured columnar structures. (c) The evolution of stresses and deformations induced by the thermal growth of alumina. (d) The effects of inter-diffusion between layers on phase evolution, on volumetric strains and on stress-inducing transformations; including the behavior of structurally compatible diffusion barriers. (e) The effects of structural evolution on the critical properties, especially the toughness of the various layers and interfaces, the constitutive behavior at high temperature, and the optical and thermal properties of the oxides. Projects are designed to foster collaboration, especially among students and post-docs, and to promote co-advising. Extramural experiences, especially at GE-GRC, allow students to have access to unique facilities and the interaction with industrial scientists contributes to developing an appreciation of how their dissertation research contributes to the overall effort and the progress of the field.FUNDING: This project is co-funded by the Office of International Science and Engineering, the Engineering directorate, and the Ceramics Program within the Mathematical and Physical Sciences directorate.

非技术描述：已经召集了一个跨学科的学术/行业团队，以对用于燃气轮机组件的热和环境保护的分层多功能系统的基本方面进行研究。 这些材料系统提供了发动机效率的量子提高，并为国家能源和运输部门的经济和环境影响以及美国行业的全球竞争力的经济和环境影响提供了利益。 目前，由于对这些多物质非平衡系统如何在暴露于现代技术中遇到的最恶劣的环境之一时会随着时间的推移而发展，因此目前无法实现这一诺言。 研究小组的目的是通过关注化学，内部结构和层次和接口形态之间的基本联系，随着时间的推移的发展，对属性的影响以及与最终损害系统完整性的机制的相关性来提高这种理解。并导致失败。 该计划通过（i）激励学生在技术重要的问题的背景下学习学科的科学基础，为其提供独特的教育机会，（ii）作为跨学科团队的成员，其中包括来自该领域的世界领先公司的科学家（通用电气）与具有不同背景和专业知识的学者合作，并且（iii）在总理的公司研究中心（GE-Global Research）访问实习。 随着研究变得越来越全球，学生在国外进行研究的经验是无价的。 该计划在欧洲，拉丁美洲和太平洋地区的合作机构（包括班加罗尔的GE-GRC）提供了此类机​​会。 该计划将受益于参与大学的出色外展基础设施，以及涉及本科生和人为不足群体成员的研究人员的可靠记录。 该计划的基本性质，对对美国经济至关重要的技术的前瞻性影响以及学生可用的教育丰富经验与NSF及其赞助计划的目标完全一致。技术细节：此类的总体目标。计划是在典型的燃气轮机发动机的极端环境以及这些如何影响系统性能的情况下，对分层系统中结构演化的动力学发展进行基本理解。建立统治物理化学现象内外的基本面，将为下一代涡轮系统的保护概念改进，以在较高温度下运行。 生成的信息还将促进用于设计和耐用性评估的系统级模型的验证和完善。 该研究的目的是通过将组件/层功能与导致其降解的进化过程相结合，对技术上重要的系统产生至关重要的影响。 由于系统的复杂性和层的规模，新的高分辨率探针占据了中心作用。 在以下五个主题中设想了科学进步。 （a）由亚稳态相位的分解和多掺杂系统中的聚类引起的耐火氧化物的相位演变。 （b）氧化物中的表面扩散，包括其对掺杂剂的依赖性及其对纹理柱状结构烧结的影响。 （c）氧化铝的热生长引起的应力和变形的演变。 （d）层之间的相互扩散对相位进化，体积菌株和诱导压力转化的影响；包括结构兼容的扩散屏障的行为。 （e）结构演化对临界特性的影响，尤其是各个层和界面的韧性，高温下的本构行为以及氧化物的光学和热性能。 项目旨在促进协作，尤其是在学生和毕业后，并促进共同努力。 外壁外经验，尤其是在GE-GRC，使学生能够获得独特的设施，与工业科学家的互动有助于建立对他们的论文研究如何促进整体努力和领域进步的欣赏。资金：此项目是：该项目是由国际科学与工程办公室，工程局和陶瓷计划共同资助了数学和物理科学局。