SGER: A Study of a Ordered Body Centered Cubic Structure Superalloy Formed by Spinodal Decomposition

SGER：旋节线分解形成的有序体心立方结构高温合金的研究

• 批准号: 0314209
• 负责人: Ian Baker
• 金额: $ 6.92万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-05-15 至 2005-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0314209&HistoricalAwards=false
• 关键词: SGER; Study; Ordered; Body; Centered

In this SGER proposal, scientifically interesting features of a new quaternary alloy (Fe30Ni20Mn25Al25) will be examined to determine whether this particular alloy system would be useful as a structural material. This new alloy is a bcc equivalent of a nickel-based superalloy that has been used for high temperature structures. A major objective is to investigate in detail the kinetics of both the spinodal decomposition and the phase stability in bulk. In-situ high temperature transmission electron microscopy will be used to characterize phase coarsening and stability. Deformation behaviors will be characterized using both bulk and in-situ straining experiments in transmission electron microscope. The alloy will be considered in both as-cast and following different heat treatments to determine the optimum process conditions for sufficient ductility without sacrificing high-temperature strength. If successful, results from this work will have applicability to other alloy system since the spinodal decomposition, followed by ordering represents a new way of manipulating microstructures.The educational impacts include training a M.S. student and two undergraduates who will work on the project. They will acquire varying degrees of skill in materials characterization techniques and mechanical testing. In addition, a close collaboration with ORNL is planned wherein the materials will be processed at the national laboratory.

在这个SGER提案中，将研究一种新的四元合金（Fe30Ni20Mn25Al25）的科学有趣特征，以确定这种特殊的合金体系是否可以用作结构材料。这种新合金相当于用于高温结构的镍基高温合金。一个主要的目的是研究详细动力学的spinodal分解和相稳定性的整体。采用原位高温透射电镜对相粗化和稳定性进行表征。变形行为将通过体应变和原位应变实验在透射电镜下进行表征。合金将在铸态和不同的热处理中进行考虑，以确定在不牺牲高温强度的情况下具有足够延展性的最佳工艺条件。如果成功，本研究的结果将适用于其他合金体系，因为旋多分解后排序代表了一种操纵微观组织的新方法。教育方面的影响包括培训一名硕士学生和两名将参与该项目的本科生。他们将在材料表征技术和机械测试方面获得不同程度的技能。此外，计划与ORNL密切合作，其中材料将在国家实验室进行处理。