Structure-Property-Composition Relationships in Trialuminide Alloys

三铝化物合金的结构-性能-成分关系

• 批准号: 9400507
• 负责人: Donald Mikkola
• 金额: $ 35.76万
• 依托单位: Michigan Technological University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-01 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9400507&HistoricalAwards=false
• 关键词: Structure; Property; Composition; Relationships; Trialuminide

9400507 Mikkola This research is aimed at understanding the mechanical properties of cubic forms of trialuminides. The work focuses on various cubic aluminum-titanium-chromium and aluminum-titanium-manganese alloys, though it is expected that the results will be important to the understanding of other alloys having the cubic L12 structure. These chromium and manganese ternary alloys have many desirable properties, but are unusual in that, while they are relatively soft and have little tensile ductility, failing by transgranular fracture. Similar behavior can be found among some other potentially useful intermetallics. The primary thrust of the research is to improve these alloys through additional alloying, based in large part on studies of the micromechanisms of plastic deformation by high resolution transmission electron microscopy. In this approach weak-beam imaging is combined with computer simulation of images and related to the mechanical behavior of the alloys as a function of temperature and composition. It is the intent of this research to define this behavior in the cubic trialiminides, thereby sorting out the wide variety of conflicting ideas and interpretations found in the literature. Specific details of interest include the nature of the superdislocation configurations and dissociation mechanisms and how these change with temperature and composition; and, further, how these changes determine the mechanical properties, including ductility, work hardening rates, and the occurrence of serrated stress-strain behavior. %%% It is expected that this research will lead to improvement of the properties and engineering potential of the cubic trialuminides. Effective modeling of the deformation behavior should contribute in a meaningful way to the future of intelligent alloy design. ***

9400507 Mikkola本研究旨在了解立方相三铝化物的机械性能。这项工作主要集中在各种立方铝钛铬合金和铝钛锰合金上，尽管预计其结果将对理解其他具有立方L12结构的合金具有重要意义。这些铬和锰三元合金具有许多理想的性能，但不寻常之处在于，它们相对较软，拉伸塑性很小，无法通过穿晶断裂来实现。在其他一些可能有用的金属间化合物中也可以发现类似的行为。这项研究的主要目的是通过额外的合金化来改善这些合金，这在很大程度上是基于高分辨电子显微镜对塑性变形微观机制的研究。在这种方法中，弱束成像与图像的计算机模拟相结合，并与合金的力学行为作为温度和成分的函数相关联。这项研究的目的是在立方Trialimide中定义这种行为，从而理清文献中发现的各种相互冲突的想法和解释。感兴趣的具体细节包括超位错组态和解离机制的性质以及这些机制如何随温度和成分变化；以及这些变化如何决定力学性能，包括延性、加工硬化率和锯齿状应力-应变行为的发生。%预计这项研究将有助于改善立方三铝化物的性能和工程潜力。变形行为的有效建模将对智能合金设计的未来做出有意义的贡献。***