CAREER: Engineering Meta-magnetic Shape Memory Alloys as the Future Generation of High Performance Magnetic Actuators

职业：设计超磁形状记忆合金作为下一代高性能磁致动器

• 批准号: 0954541
• 负责人: Haluk Karaca
• 金额: $ 40万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0954541&HistoricalAwards=false
• 关键词: CAREER; Engineering; Meta; magnetic; Shape

The research objective of this Faculty Early Career Development (CAREER) award is to study the fundamental properties of meta-magnetic shape memory alloys (SMAs) to establish composition, microstructure and property relationship and to engineer the microstructure through thermo-mechanical treatments to result in magnetic actuators with high stress output. Meta-magnetic SMAs are a new class of smart materials where their actuation mechanism is based on field-induced phase transformation which results in one order of magnitude greater actuation strain than magnetostrictive materials and one order of magnitude higher actuation stress than well known NiMnGa magnetic SMAs, comparable to those of conventional SMAs. A deeper understanding of meta-magnetic SMA behavior will be gained by a systematic study of the effects of composition, crystal orientation, magneto-thermo-mechanical treatments and stress state on shape memory and magnetic properties including superelasticity, shape memory effect, transformation temperatures, hysteresis, Curie temperature, and saturation magnetization of transforming phases. If successful, this research will enable the fabrication of a new generation of magnetic actuators at various scales that will provide an alternative to the existing solid-state actuator technology which in turn will benefit the economic development of our society. These actuators are expected to result in high actuation stress (30 MPa/Tesla), high actuation strain (2-4%), and to operate at medium frequencies (10 kHz) under low magnetic fields ( 2 Tesla). An integrated research and educational program will be built on strong foundations by bridging mechanics and materials science communities, through the use of smart materials in particular, to expose undergraduate students to multidisciplinary research early in their academic careers. Educating, empowering and exciting "front-line" middle and high school teachers by involving them in projects on smart materials through collaborations with well-established local outreach programs available at University of Kentucky will attract a large number of under-represented and economically-challenged students to pursue their future careers in engineering.

该学院早期职业发展（CAREER）奖的研究目标是研究元磁性形状记忆合金（SMA）的基本特性，以建立成分，微观结构和性能关系，并通过热机械处理来设计微观结构，以产生具有高应力输出的磁致动器。亚磁性SMA是一类新型的智能材料，其致动机制基于场致相变，这导致比磁致伸缩材料大一个数量级的致动应变和比众所周知的NiMnGa磁性SMA高一个数量级的致动应力，与常规SMA的致动应力相当。通过系统地研究材料的组成、晶向、磁热机械处理和应力状态对形状记忆和磁性能的影响，包括超弹性、形状记忆效应、相变温度、磁滞、居里温度和相变相的饱和磁化强度，可以更深入地理解亚磁性SMA的行为。如果成功，这项研究将能够制造各种规模的新一代磁致动器，这将为现有的固态致动器技术提供替代方案，从而有利于我们社会的经济发展。预期这些致动器将导致高致动应力（30 MPa/Tesla）、高致动应变（2-4%），并且在低磁场（2 Tesla）下以中等频率（10 kHz）操作。一个综合的研究和教育计划将建立在坚实的基础上，通过桥接力学和材料科学界，特别是通过使用智能材料，使本科生在学术生涯的早期接触多学科研究。通过与肯塔基州大学完善的当地推广计划合作，让“一线”初中和高中教师参与智能材料项目，教育，授权和激励他们，将吸引大量代表性不足和经济困难的学生追求他们未来的工程职业生涯。