FRG: Microstructure Design of Advanced Multi-Domain Magnetic Materials Under Applied Fields

9905725王这个重点研究小组（FRG）的综合方案包括实验，分析和模拟，以发展复杂的多域形成的基本和技术理解（例如，组成、结构和磁性）微结构。 这允许通过先进的热机械和热磁处理来定制多域微结构以获得所需性能的可能性。 研究的材料系统包括Fe-Cr-Co和Co-Pt的高矫顽磁性合金，其磁畴结构是自调节的，以适应不断变化的复杂的多相微观结构。 先进的表征技术被用来提供准确的描述，现实的分析和模拟模型制定的合金系统。 进行一系列三维（3D）计算机模拟以表征作为内部失配应变和施加的磁场和应力场的函数的结构和磁畴的尺寸、形状、取向、空间布置和动态切换。 研究了这些微观结构特征对合金磁性能的影响。 在模拟的同时，进行热磁和热弹性处理和磁性能测量，以验证模拟预测和测试的关键假设。 该计划的早期阶段侧重于基本理解和模型开发，而后期阶段则针对新技术挑战设计和开发新型多域微结构的综合方法的实际应用。 该补助金由MPS多学科活动办公室和材料研究部的金属研究计划共同资助。联邦德国应该对科学、技术和教育产生重要影响。 在应用领域的这些系统中的复杂的微观结构的理解提高。 开发的数值方法将允许逼真的三维计算原型的多域微观结构的一系列先进的应用。 这些进展将最大限度地减少在新合金开发的微观结构工程中进行试错实验的需要。 计算设计工具与用户友好的界面开发是唯一适合通过本科生和研究生的指示。 该项目还将为参与的学生提供一个独特的机会，让他们接触到先进的模拟方法和实验表征技术的结合。 它将为新一代材料科学家和工程师提供一个很好的知识转移工具，他们能够在工作场所直接为基于科学的微结构工程做出贡献。

9905725WangThis Focused Research Group (FRG) integrated program includes experimentation, analysis and simulation to develop a fundamental and technological understanding of the formation of complex multi-domain (e.g., compositional, structural and magnetic) microstructures under applied magnetic and stress fields in magnetic materials. This allows for the possibility of tailoring multi-domain microstructures for desired properties through advanced thermomechanical and thermomagnetic treatments. Material systems investigated include the high-coercive magnetic alloys of Fe-Cr-Co and Co-Pt, whose magnetic domain structure is self-adjusted to the evolving complex multi-phase microstructure. Advanced characterization techniques are used to provide accurate descriptions of the alloy systems upon which realistic analytical and simulation models are formulated. A series of three-dimensional (3D) computer simulations are performed to characterize the size, shape, orientation, spatial arrangement and dynamic switching of the structural and magnetic domains as functions of internal misfit strain and applied magnetic and stress fields. Effects of these microstructural features on the magnetic properties of the alloys are examined. In parallel with the simulations, thermomagnetic and thermoelastic treatments and magnetic property measurements are carried out to validate the simulation predictions and to test key assumptions. Early stages of the program focus on fundamental understanding and model development, while later stages address practical applications of the integrated approach to the design and development of novel multi-domain microstructures for new technological challenges. The grant is co-funded between the MPS Office of Multidisciplinary Activities and the Metals Research Program in the Division of Materials Research.%%%This FRG should have important impact on science, technology and education. Improved understanding of the complex microstructures in these systems under applied fields is expected. The numerical methods developed will allow realistic 3D computational prototyping of the multi-domain microstructures for a range of advanced applications. These advances will minimize the need for trail-and-error experiments in microstructural engineering for new alloy development. The computational design tools with user-friendly interfaces to be developed are uniquely suited for adoption to undergraduate and graduate instructions. The project will also provide a unique opportunity for the students involved to be exposed to a combination of advanced simulation methods and experimental characterization techniques. It will provide an excellent vehicle for knowledge transfer to a new generation of materials scientists and engineers who are able to contribute directly to science based microstructural engineering in their workplace.***