窄滞后NiCoMnSn记忆合金薄膜及其低磁场驱动马氏体相变及磁感生应变研究

项目名称： 窄滞后NiCoMnSn记忆合金薄膜及其低磁场驱动马氏体相变及磁感生应变研究

项目编号： No.51301054

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 田晓华

作者单位： 哈尔滨理工大学

项目金额： 25万元

中文摘要： 磁驱相变记忆合金薄膜中驱动马氏体相变及磁感生应变的临界磁场高是限制其发展的关键问题。本项目提出在NiCoMnSn磁驱相变记忆合金薄膜中，通过减小马氏体相变热滞后，降低临界磁场的新思路。项目拟从研究NiCoMnSn薄膜的马氏体相变热滞后行为入手，揭示薄膜成分、热处理工艺与相变热滞后之间的内在联系，确定获得窄相变滞后的合金成分及热处理工艺优化准则，制备窄滞后NiCoMnSn薄膜；建立相变窄滞后与母相-马氏体界面结构及其可动性、马氏体组织结构和晶体缺陷的内在联系，揭示马氏体相变窄滞后机制；研究低磁场驱动窄滞后马氏体相变的内在规律，建立磁场作用下的马氏体相变热力学模型；研究低磁场驱动磁感生应变的规律及机制，揭示临界磁场与母相-马氏体界面可动性及相变窄滞后之间的内在联系，确定获得低临界磁场、高恢复力和大应变NiCoMnSn磁性形状记忆合金薄膜的设计准则，为新型磁性形状记忆合金薄膜的发展奠定基础。

中文关键词： 磁性记忆合金；马氏体相变；磁感生应变；薄膜；NiCoMnSn

英文摘要： The high critical magnetic field for driving the martensitic transformation and magnetic-field-induced strain is the crucial problem limiting the development of magnetic field-induced phase transformation shape memory alloy thin film. In this project, the new idea for decreasing the critical magnetic field is proposed in NiCoMnSn thin film by narrowing its thermal hysteresis width of martensitic transformation. The thermal hysteresis behavior of NiCoMnSn thin film is systematically investigated. The internal relationships between composition, heat treatment process and thermal hysteresis of martensitic transformation are revealed. The optimal principle for composition and heat treatment process to achieve narrow hysteresis martensitic transformation is determined. Then the narrow hysteresis NiCoMnSn thin film is fabricated. Moreover, the internal relationships among narrow hysteresis, the interface structure between parent phase and martensite as well as its motion characteristics, microstructure of martensite, and crystal defects are founded. The mechanism of narrow hysteresis of martensitic transformation is clarified. The internal law of the low magnetic field-induced martensitic transformation is researched. The thermal model of martensitic transformation under application of magnetic field is founded. In ad

英文关键词： Magnetic shape memory alloy；Martensitic transformation；Magnetic field-induced strain；Thin film；NiCoMnSn