Collaborative Research: Two Phase Highly Magnetostrictive Materials

技术概述：缺陷的重新定向可以影响技术上重要的固体宏观性能，如电钢中的迟滞损耗。本项目将研究对称性低于母体的相干纳米沉淀物磁化取向改变所引起的磁致伸缩。铁钴合金将作为研究的模型体系，因为Fe40Co60中存在初步的微观和宏观证据，表明其大磁致伸缩（lambda100=200ppm）是由于这一机制造成的。所获得的见解将用于开发具有增强磁致伸缩的新合金。非技术概述：该项目拟研究两相功能材料，主要是金属合金的磁致伸缩。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，研究生和本科生将在材料合成和最先进的表征技术方面进行培训。拟议中的研究将提高少数族裔学生在理工科领域的竞争力，并扩大有才华的非洲裔美国科学家和工程师的数量，他们将扩大高科技少数族裔劳动力。计划向马里兰州高中推广将确保拟议的研究与高中人口中潜在感兴趣的部分联系起来。

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.