CAREER: Understanding Elevated-Temperature Grain Boundary Deformation Processes of High-Temperature Structural Alloys through Grain Boundary Engineering

职业：通过晶界工程了解高温结构合金的高温晶界变形过程

• 批准号: 0134789
• 负责人: Carl Boehlert
• 金额: $ 45.27万
• 依托单位: Alfred University NY State College of Ceramics
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0134789&HistoricalAwards=false
• 关键词: CAREER; Understanding; Elevated; Temperature; Grain

This project aims at applying grain-boundary engineering to develop high-temperature structural alloys such as Ni-based superalloy and Ti2AlNb intermetallics. Major objective of the proposed project is to develop better understanding of the inter-relationship of processing steps, grain boundary character distribution (GBCD), and creep behavior of high-temperature structural alloys. The main goals of this study are ; (1) to process microstructures with a distribution of random and special grain boundaries; (2) to measure grain boundary character distribution (GBCD); (3) to perform creep testing of varied microstructures; (4) to model the effects of grain size, grain boundary sliding, and grain boundary character on mechanical behavior. The project leads to the development of a processing methodology useful to enhance the mechanical behavior of high-temperature structural materials. The educational outreach component incorporates the research tools used in the research portion of the project and contributes to an increase in the number of undergraduate students majoring in materials science and engineering (MS&E).%%%The research develops new understanding of the deformation mechanisms of structural materials beyond the present state of the art through grain-boundary engineering. The results are applicable for development of better materials for high-temperature applications. ***

本计画旨在应用晶界工程技术开发镍基高温合金、钛铝铌金属间化合物等高温结构合金。该项目的主要目标是更好地了解高温结构合金的加工步骤、晶界特征分布（GBCD）和蠕变行为之间的相互关系。本研究的主要目的是：（1）加工具有随机和特殊晶界分布的微结构;（2）测量晶界特征分布（GBCD）;（3）对不同微结构进行蠕变试验;（4）模拟晶粒尺寸、晶界滑动和晶界特征对力学行为的影响。该项目导致了一种加工方法的发展，有助于提高高温结构材料的机械性能。教育推广部分包括项目研究部分使用的研究工具，并有助于增加材料科学与工程专业（MS E）的本科生人数。该研究通过晶界工程，超越现有技术水平，对结构材料的变形机制有了新的认识。研究结果可为开发更好的高温应用材料提供参考。***