Novel Microstructures and Enhanced Properties Through High Magnetic Field Treatment and Extraordinary Thermomechanical Processing in Ferromagnetic Alloys

通过强磁场处理和特殊热机械加工在铁磁合金中实现新颖的微观结构和增强的性能

• 批准号: 0706446
• 负责人: William Soffa
• 金额: --
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-15 至 2013-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0706446&HistoricalAwards=false
• 关键词: Novel; Microstructures; Enhanced; Properties; Through

TECHNICAL: The major thrust of this research program is to systematically explore the application of high magnetic field processing coupled with far-from-equilibrium (FFE) materials synthesis and a "combined reactions" approach as a tool for tailoring the length scales and morphologies of transformation products in select ferromagnetic alloys. The goal is to use this hybrid processing and heat treatment to drive the transformation behavior and microstructural evolution along reaction paths generally not accessible to conventional processing methodologies and produce unique structural states with enhanced physical, mechanical and chemical properties. The combined reactions approach involves inducing two or more solid state transformations, e.g. recrystallization and ordering/decomposition, to occur concomitantly, sequentially and/or synergistically. The Fe-Pd and Mn-Al-(C) permanent magnet alloys are chosen for the studies based on their rich transformation behavior and highly structure-sensitive magnetic properties. The materials processing strategy is expected to produce ultra-fine microstructures including bulk nanostructured ferromagnets as indicated by preliminary results. The high magnetic field processing will be carried out in cooperation with the Oak Ridge National Laboratory (ORNL) Materials Processing Group and the National High Magnetic Field Laboratory (NHMFL) at Florida State University. NON-TECHNICAL: This research should contribute directly to the development of the so-called electromagnetic processing of materials (EPM), particularly the science relating to high magnetic field processing as a potentially viable new industrial approach to tailoring unique materials including nanostructured steels and bulk ferromagnets. This new dimension in advanced materials processing could catalyze the advent of a new era in currently mature and well-entrenched technologies such as the steel industry as well as impacting rapidly emerging areas such as nanotechnology. Importantly, although the research addresses two particular ferromagnetic alloy systems, the project is aimed at establishing a fundamental basis for understanding the complex interplay of thermodynamic, kinetic and mechanistic factors involved which will be generally applicable to a range of materials. In addition to an ambitious research agenda, a substantial education and outreach component has been developed involving three main parts: 1) Hands-on-Science (HOS) laboratory experience for secondary school students. 2) Workshops for Secondary School Science Teachers (Magnetism and Modern Technology). 3) Interaction with ORNL and the placement of URA students as liaison researchers between ORNL and the University of Virginia (UVA). The URA positions will be used effectively to attract minorities and women to careers in engineering and science.

技术支持：该研究计划的主要目的是系统地探索高磁场处理与远离平衡（FFE）材料合成和“组合反应”方法的应用，作为定制选定铁磁合金中转变产物的长度尺度和形态的工具。目标是使用这种混合加工和热处理来驱动沿着常规加工方法通常不可及的反应路径的转变行为和微观结构演变，并产生具有增强的物理、机械和化学性质的独特结构状态。组合反应方法涉及诱导两种或更多种固态转化，例如重结晶和有序化/分解，以伴随地、顺序地和/或协同地发生。基于Fe-Pd和Mn-Al-（C）永磁合金丰富的相变行为和高结构敏感的磁性能，选择了这两种永磁合金进行研究。材料加工策略，预计将产生超细微结构，包括散装纳米结构的铁磁体的初步结果表明。高磁场处理将与橡树岭国家实验室（ORNL）材料处理组和佛罗里达州立大学的国家高磁场实验室（NHMFL）合作进行。非技术性：这项研究将直接促进所谓的材料电磁加工（electromagnetic processing of materials，简称EMT）的发展，特别是与高磁场加工相关的科学，作为一种潜在可行的新工业方法，用于定制独特的材料，包括纳米结构钢和大块铁磁体。先进材料加工中的这一新维度可能会促进目前成熟和根深蒂固的技术（如钢铁工业）新时代的到来，并影响纳米技术等快速新兴领域。重要的是，尽管该研究涉及两种特定的铁磁合金系统，但该项目旨在为理解所涉及的热力学，动力学和机械因素的复杂相互作用奠定基础，这些因素通常适用于一系列材料。除了雄心勃勃的研究议程外，还制定了一个实质性的教育和外展部分，包括三个主要部分：1）中学生的科学实验室实践经验。2)为中学科学教师举办讲习班（磁性和现代技术）。3)与ORNL的互动和URA学生作为ORNL和弗吉尼亚大学（UVA）之间的联络研究人员的位置。将有效地利用URA的职位来吸引少数民族和妇女从事工程和科学职业。