U.S.-Czech Materials Research on Modeling of Magnetization for Evaluation of Microstructure

由爱荷华州立大学的David Jiles及其合作伙伴，布拉格捷克物理研究所的Ladislav Pust和Ivan Tomas共同开展的这项美国-捷克研究项目，将通过开发相关磁化过程的计算机模型来研究磁性材料的结构和性质之间的关系。这些努力将以能量耗散为特征，这是磁化的结果，其中布洛赫壁与与基体具有不同磁性的区域相互作用。研究人员打算强调在较大的空隙、非磁性包裹体和高局部应力区域上钉住磁畴壁。这项合作工作将包括将理论模型计算与铁基和镍基合金的实验数据进行比较。研究结果应为材料磁性能的描述提供一个更完整的理论框架，即磁滞曲线建模，从而提高我们对微观结构对磁性能影响的认识。如果成功，研究结果可能应用于磁性无损评估方法，这是材料研究和工程中广泛关注的领域。该理论材料研究项目通过使美国和中欧的专家在共同感兴趣和能力强的领域结合互补的人才和共享研究资源，实现了推进科学知识的计划目标。

INT 9732135JilesThis U.S.-Czech research project between David Jiles of Iowa State University and partners, Ladislav Pust and Ivan Tomas of the Czech Institute of Physics, Prague, will examine the relationship between structure and properties of magnetic materials by developing computer based models of relevant magnetization processes. These efforts will feature energy dissipation as a result of magnetization where Bloch walls interact with regions that have different magnetic properties from the matrix. The researchers intend to emphasize pinning of magnetic domain walls on larger voids, non-magnetic inclusions, and regions of high localized stress.This cooperative work will involve comparing theoretical model calculations with experimental data measured on iron and nickel based alloys. Results should provide a more complete theoretical framework for the description of magnetic properties of materials, i.e., hysteresis curve modeling, thereby improving our understanding of microstructural effects on magnetic properties. If successful, findings may be applied in magnetic nondestructive evaluation methods, an area of broad interest in materials research and engineering.This project in theoretical materials research fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence.