CAREER: Nanostructured Intermetallic Alloys - Annealing Behavior, Microstructural Control and Influence of Scale in Reversibly Ordering Systems

该职业奖旨在对可逆有序金属系统的加工-微观结构-性能关系和退火行为进行定量的、基于机制的描述。基于铁磁性L10-和l12 -有序金属间相的Fe-Pd体系模型合金将是进行剧烈塑性变形（SPD）处理的重点。主要的实验技术有差示扫描量热法（DSC）、振动扫描磁强计、力学测试以及透射电子显微镜和x射线衍射的现场和死后显微结构观察。性能优化和微观结构控制的策略将基于对观察到的微观结构变化负责的过程的机制模型来设计。对大变形可逆有序合金反应工艺的独特开发将用于纳米尺度的微观组织控制。教育部分的重点是开发基于网络的教育工具，并将其应用于高级理科本科和研究生课程。这些新工具将纳入从研究中获得的结果和实验能力，并将免费提供给公众。该奖项将促进国内和国际合作，为金属间化合物和先进材料物理冶金领域的杰出研究人员提供独特的互动机会。这项研究有助于系统地研究具有商业潜力的真正大块纳米结构功能金属间合金的尺度相关效应。这些功能金属间化合物在先进的永磁体技术中有相当大的兴趣，例如薄膜介质，数据存储和未来的微型设备。将微观结构细化到纳米级为性能改进提供了巨大的潜力。这些金属间化合物和许多其他金属间化合物的未来成功需要详细了解加工过程中相互竞争的固态反应之间的协同相互作用

0094213WiezorekThis CAREER award is aimed at a quantitative, mechanism-based description of the processing-microstructure-property relationships and annealing behavior in reversibly ordering metallic systems. Model alloys based on the ferromagnetic L10- and L12-ordered intermetallic phases in the Fe-Pd system undergoing severe plastic deformation (SPD) processing will be the focus of the research. The main experimentation techniques are differential scanning calorimetry (DSC), vibrating-scanning-magnetometers, mechanical testing, and in-situ and post-mortem microstructural observations by transmission electron microscopy and x-ray diffraction. Strategies for property optimization and microstructural control will be devised based on the mechanistic models of the processes responsible for the observed microstructural changes. Unique exploitation of reaction processing of heavily deformed reversibly ordering alloys will be used to control microstructures at the nanoscale. The educational component centers on the development of Web-based educational tools and their implementation into upper-level MS&E undergraduate and graduate courses. These new tools will incorporate results and experimental capabilities developed from the research and they will be made available to the public cost-free. The national and international collaborations that will be fostered through this award offer unique opportunities for interaction with outstanding researchers in the field of intermetallics and physical metallurgy of advanced materials. %%%This research facilitates a systematic study of scale-related effects in truly bulk nanostructured functional intermetallic alloys with commercial potential. There is considerable interest in these functional intermetallics for advanced permanent magnet technologies, e.g. thin film media, data storage and futuristic micro-devices. Refinement of the microstructure to the nanoscale offers enormous potential for property improvements. Future success of these and many other intermetallics requires a detailed knowledge of the synergistic interplay between competing solid-state reactions during processing.***