GOALI: Fundamentals of High Temperature Deformation in Polycrystalline Ni-Al-Nb Eutectic Alloys

GOALI：多晶 Ni-Al-Nb 共晶合金高温变形的基础

• 批准号: 1006953
• 负责人: Sammy Tin
• 金额: $ 41.05万
• 依托单位: Illinois Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1006953&HistoricalAwards=false
• 关键词: GOALI; Fundamentals; Temperature; Deformation; Polycrystalline

TECHNICAL SUMMARY: Novel polycrystalline pseudo-ternary eutectic gamma-gamma'-delta alloys, based on the Ni-Al-Nb system, have been recently demonstrated to possess a promising set of high temperature properties that may permit radical changes in the design of modern gas turbine engines and lead to revolutionary improvements in performance and efficiency. This aim of this research program will be to establish a fundamental understanding of the mechanisms governing the high temperature strength of these alloys. This will be accomplished by selecting a series of near eutectic Ni-Al-Nb based alloys with the objectives of quantifying how alloying additions and the equilibrium volume fraction of delta phase affect the strength and creep resistance. Both bulk and novel small-scale mechanical testing methods will be used to systematically isolate contributions from chemical and microstructural strengthening at elevated temperatures. Detailed transmission electron microscopy studies will be used to elucidate the underlying deformation mechanisms governing the mechanical properties of the alloy system. Computational modeling of the deformation mechanics will be used to complement the experimental measurements and assist in the formulation of a physics-based constitutive model capable of accurately predicting the deformation characteristics of this novel alloy system at elevated temperatures. Results from the proposed program are expected to suggest new directions for the development of revolutionary new materials that have the potential to replace conventional Ni-base superalloys in high temperature structural applications.NON-TECHNICAL SUMMARY: Advances in high temperature structural materials have served as key enabling technologies that have been critical to the development of ultra-efficient gas turbines with reduced fuel consumption, and minimization of CO2 and NOX emissions. In addition to the economic and environmental benefits, there exists a strategic need for the U.S. to maintain technological leadership in this field due to the importance of advanced gas turbine technologies for power generation, space exploration, aerospace/marine propulsion and various other defense related applications. The aim of the proposal is to investigate the fundamental deformation behavior of a novel new class of high temperature structural materials by combining experimental measurements with physics-based constitutive models. With direct involvement of the Co-PI from Rolls-Royce North American Technologies, graduate and undergraduate students will have the opportunity to contribute significantly to technological advancements within a fast-paced industrial research setting and develop innovative solutions for industrially relevant problems. In conjunction with the proposed research, both the PI and the graduate students will be actively involved with promoting educational outreach activities aimed at local Chicago-area secondary school science teachers to enhance the middle/high school curricula and raise the students? awareness of materials science and engineering. This will include the provision of resources and support for both the ASM Materials Camp for high school students and the ASM Teacher's Camp for high school science teachers.

技术综述：基于Ni-Al-Nb系的新型多晶准三元共晶伽马-伽马‘-三角洲合金，最近被证明具有一系列有希望的高温性能，这些高温性能可能使现代燃气轮机发动机的设计发生根本性变化，并导致性能和效率的革命性改进。这项研究计划的目的将是建立对这些合金高温强度控制机制的基本理解。这将通过选择一系列近共晶的Ni-Al-Nb基合金来实现，目的是量化合金化加入量和三角洲相的平衡体积分数对强度和蠕变抗力的影响。将使用大量和新的小规模机械试验方法，系统地将高温下的化学和微观结构强化的贡献隔离开来。详细的电子显微镜研究将被用来阐明控制合金系统机械性能的潜在变形机制。变形力学的计算模型将被用来补充实验测量，并帮助建立基于物理的本构模型，该模型能够准确地预测这种新型合金系统在高温下的变形特征。拟议计划的结果有望为革命性新材料的开发提供新的方向，这些材料有可能在高温结构应用中取代传统的镍基高温合金。非技术摘要：高温结构材料的进步已成为关键的使能技术，这些技术对于开发降低燃料消耗、最大限度减少二氧化碳和NOX排放的超高效燃气轮机至关重要。除了经济和环境利益外，由于先进的燃气轮机技术在发电、太空探索、航空航天/海洋推进和各种其他与国防相关的应用中的重要性，美国在这一领域保持技术领先地位的战略需要。该方案的目的是通过实验测量和基于物理本构模型相结合的方法来研究一类新型高温结构材料的基本变形行为。在罗尔斯-罗伊斯北美技术公司的Co-PI的直接参与下，研究生和本科生将有机会在快节奏的工业研究环境中为技术进步做出重大贡献，并为与工业相关的问题开发创新解决方案。结合拟议的研究，PI和研究生都将积极参与促进针对芝加哥地区当地中学科学教师的教育推广活动，以加强初中/高中课程并提高学生的素质。具有材料科学和工程方面的知识。这将包括为高中生ASM材料夏令营和高中科学教师ASM教师夏令营提供资源和支持。