Collaborative Research: Two Phase Highly Magnetostrictive Materials

技术总结：缺陷的重新取向会影响电工钢中的磁滞损耗等固体的重要技术宏观性能。本计画将研究对称性低于母体的共格奈米沉淀物的磁化重定向所造成的磁致伸缩。铁钴合金将作为研究的模型系统，因为在Fe_（40）Co_（60）中存在初步的微观和宏观证据，这表明其大的磁致伸缩（100 =200ppm）是由于这种机制。所获得的洞察力将用于开发具有增强磁致伸缩的新合金。非技术摘要：该项目建议研究两相功能材料的磁致伸缩，主要是金属合金。显示低各向异性和大磁致伸缩的材料将被强调，因为它们非常适合于传感器或换能器等技术应用。此外，通过这项合作研究，研究生和本科生少数民族将在材料合成和国家的最先进的表征技术的培训。拟议的研究将提高少数民族学生在科学和工程学科的竞争力，扩大有才华的非洲裔美国科学家和工程师的人才库，他们将扩大高技术少数民族劳动力。计划推广到马里兰州高中将确保拟议的研究连接到高中人口的潜在感兴趣的部分。

TECHNICAL SUMMARY:The reorientation of defects can affect technologically important macroscopic properties of solids like hysteresis losses in electric steels. This project will investigate the magnetostriction caused by the reorientation of the magnetization of coherent nano-precipitates of lower symmetry than the host. Iron-cobalt alloys will serve as the model system for the investigation as preliminary microscopic and macroscopic evidence exists in Fe40Co60, which demonstrates that its large magnetostriction, lambda100=200ppm, is due to this mechanism. The insight gained will be used to develop new alloys with enhanced magnetostriction. NON-TECHNICAL SUMMARY:The project proposes to investigate the magnetostriction of two phase functional materials, predominantly metallic alloys. Materials displaying low anisotropy and large magnetostriction will be emphasized as they are very suitable for technological applications such as sensors or transducers. Additionally, through this collaborative research, graduate and undergraduate minorities will be trained in materials synthesis and state-of-the-art characterization techniques. The proposed research will increase the competitiveness of minority students in the Science and Engineering disciplines and expand the pool of talented African-American scientists and engineers, who will enlarge the high-technology minority workforce. The planned outreach to Maryland high schools will ensure that the proposed research connects to the potentially interested segment of the high school population.