Domain structures and dynamics in Ferromagnetic shape memory materials: Theory and Experiment - Continuum models of magnetic shape memory materials: modelling

磁性形状记忆材料的微观结构和磁畴模型的建立，为这种在磁场作用下可以改变其形状的活性材料的性能提供了一种真实的描述和计算方法。受最近对Ni-Mn-Ga Heusler和Fe-Pd磁性形状记忆合金的实验观察和详细分析的启发，该项目的继续扩展了理论方法，将这些材料建模为缺陷连续体，其中自适应调制表现为非平衡的纳米孪晶微观结构。利用适当的缺陷规范理论的连续体方法将被开发用于模拟纳米尺度马氏体织构。这些缺陷连续体的磁弹性耦合将被表述。所得模型将用于自适应铁磁形状记忆行为形成和转变过程的数值模拟。

Models of microstructures and magnetic domains for magnetic shape-memory materials have been developed to provide a realistic description and means to calculate performance of such active materials that can change their shape under magnetic fields. Motivated by recent experimental observations and detailed analysis on the Ni-Mn-Ga Heusler and Fe-Pd magnetic shape-memory alloys, the continuation of the project extends theoretical approaches to model these materials as defected continua, where adaptive modulations appear as non-equilibrium, nanotwinned microstructures. An continuum approach making use of appropriate gauge theories of defects will be developed to model nanoscale martensitic textures. Magnetoelastic couplings of these defected continua will be formulated. The resulting models will be employed for numerical simulations on the formation and transformation processes of adaptive ferromagnetic shape-memory behaviour.