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The Evolution of Microstructure and Defect Structure in Manganese-Aluminum-Base Ferromagnets: Pathways to Novel Processing Routes and Enhanced Properties

锰铝基铁磁体微观结构和缺陷结构的演变：新型加工路线和增强性能的途径

基本信息

批准号：
0092099
负责人：
William Soffa
金额：
$ 36万
依托单位：
University of Pittsburgh
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2001
资助国家：
美国
起止时间：
2001-02-15 至 2004-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0092099&HistoricalAwards=false
关键词：
Evolution Microstructure Defect Structure Manganese

项目摘要

0092099 Soffa This research program studies the nature of the phase transformation involved in the formation of the ferromagnetic tau-MnAl (L1o) phase in MnAl-base magnetic materials. The evolution of microstructure and defect structure which governs the development of magnetic properties in bulk alloys and thin films is examined. The research builds on the revelation that the metastable tau-MnAl phase emerges as the product of a massive transformation and that the microstructure and defect structures which evolve depend critically on the mechanistics of this phase transformation. The goal of this investigation is to use the fundamental knowledge of the transformation mechanism as a pathway for the design of new alloying strategies, heat treatments, and processing schemes to tailor the structure-property relationships in these materials. This research should also contribute to our understanding of an important genre of solid-state transformation.%%%These magnetic materials have tremendous potential in futuristic permanent magnet applications and for thin film devices including magnetic recording media. The full potential of the MnAl-base ferromagnets will only be realized when the evolution of microstructure and defect structure can be systematically controlled since their magnetic properties are extraordinarily sensitive to the structural state of the tau-MnAl phase.***

0092099 Soffa该研究项目研究了MnAl基磁性材料中铁磁性τ-MnAl（L1 o）相形成过程中所涉及的相变性质。研究了块体合金和薄膜中微观结构和缺陷结构的演变，这些结构决定了磁性能的发展。研究的基础上的启示，亚稳态τ-MnAl相出现的产品的大规模转变和演变的微观结构和缺陷结构，关键取决于这种相变的机制。本研究的目标是利用转变机制的基础知识作为设计新合金化策略、热处理和加工方案的途径，以定制这些材料的结构-性能关系。这项研究也将有助于我们理解一种重要的固态相变类型。%%%这些磁性材料在未来的永磁体应用和包括磁记录介质的薄膜器件中具有巨大的潜力。只有当微结构和缺陷结构的演变可以被系统地控制时，才能实现MnAl基铁磁体的全部潜力，因为它们的磁性能对τ-MnAl相的结构状态非常敏感。