Ni-Mn-Ga铁磁记忆合金质子辐照效应及其机理研究

项目名称： Ni-Mn-Ga铁磁记忆合金质子辐照效应及其机理研究

项目编号： No.51471060

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 蔡伟

作者单位： 哈尔滨工业大学

项目金额： 85万元

中文摘要： 质子辐照是影响航天器及其构件寿命和可靠性的重要因素。Ni-Mn-Ga铁磁记忆合金兼具快响应和大磁感生应变，在长寿命航天器中极具应用潜力，但Ni-Mn-Ga合金的质子辐照效应及微观机制尚未见报道。本研究在建立Ni-Mn-Ga合金质子入射过程中能量与质量沉积模型基础上，查明质子辐照后合金的电子结构、原子结构、原子局域结构以及缺陷结构等微观结构演化规律，揭示质子辐照影响磁学性能的物理本质；构建辐照作用下马氏体相变热力学与动力学模型；研究质子辐照Ni-Mn-Ga合金的马氏体相变行为，探明辐照参量-微观结构-马氏体相变-磁感生应变之间定量关系，揭示质子辐照影响磁感生应变的物理本质。这些研究不仅可以丰富马氏体相变基础理论，而且为Ni-Mn-Ga合金在空间领域应用设计及可靠性评估提供技术支撑。

中文关键词： Ni-Mn-Ga合金；铁磁形状记忆合金；质子辐照；马氏体相变；磁感生应变

英文摘要： Proton irradiation plays an important role in the lifetime and the reliability of the spacecraft. Ni-Mn-Ga ferromagnetically shape memory alloys is a promosing intelligent actuator material for spacecraft due to its fast response and large magnetic-field-induced strain. However, the proton irradiation effect and its mechanism of Ni-Mn-Ga alloys are still unknown. In present study,the sedimentary model of energy and mass in the process of irradiation is to be set up, and the evolution of electronic structure, atomic structure, atomic local structure and defect structure of irradiated Ni-Mn-Ga alloys are systematically investigated, and the trinsic reason of the irradiation influence on magnetic properties is revealed. The thermodynamic model for the martensitic transformation under proton irradiation will be established, and the martensitic transformation of irradiated Ni-Mn-Ga alloys is to be investigated, and the relationship among irradiation parameters, microstructure, martensitic transformation and magnetic-field-induced strain is clarifed, and the physical nature of the effect of proton irradiation on magnetic induced strain characteristics is revealed. This study is not only enriche the martensitic transformation theory, but also provides the theoretical basis of design and reliability evaluation for the application of Ni-Mn-Ga in aerospace.

英文关键词： Ni-Mn-Ga alloys;ferromagnetically shape memory alloys;Proton irradiation;Martensitic transformation;Magnetic-field-induced strain