Phase-field modelling of magnetically induced microstructure evolution in martensitic polycrystals

马氏体多晶磁致微观结构演化的相场建模

• 批准号: 28422318
• 负责人: Professorin Dr. Britta Nestler
• 金额: --
• 依托单位: Institut für Angewandte Materialien - Mikrostruktur-Modellierung und Simulation (IAM-MMS)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/28422318?language=en
• 关键词: Phase; field; modelling; magnetically; induced

The magnetomechanical responses of magnetic shape memory (MSM) alloys to external magnetic fields are correlated with the coupled magneto-elastic domain structure evolutions in these materials. Hence, the kinetic pathways of the domain evolutions play a key role in determining the materials properties. Mesoscopic simulations based on phase-field modelling can provide valuable information to understand the dynamic processes and main quantities affecting the MSM effect. Therefore the aim of this project is to develop both, a new phase-field model and parallel 3D simulator for MSM alloys. The model formulation includes elastic, magnetic and elastomagnetic free energy contributions and different martensitic crystal structures. The thermodynamical data and free energies of the considered binary Fe-Pd and Fe-Pt and ternary Ni-Mn-Ga alloys needed to configurate the phase-field model will be exchanged from cooperating groups of the SPP 1239. The framework should be capable to describe the magnetic-field-induced evolution of polycystalline and polytwinned microstrüctures, of discontinuous structures with different twin boundaries and compositions, of the coupled process of grain growth (coarsening) and magnetically driven grain boundary motion, of grain- and twin-boundary diffusion and segregation patterns.

磁性记忆（MSM）合金对外部磁场的磁力机械响应与这些材料中耦合的磁弹性域结构的演变相关。因此，域演变的动力学途径在确定材料特性方面起着关键作用。基于相位场建模的介观模拟可以提供有价值的信息，以了解影响MSM效应的动态过程和主要数量。因此，该项目的目的是开发MSM合金的新相位模型和并行的3D模拟器。模型公式包括弹性，磁和弹性自由能贡献以及不同的马氏体晶体结构。 The thermodynamical data and free energies of the considered binary Fe-Pd and Fe-Pt and ternary Ni-Mn-Ga alloys needed to configurate the phase-field model will be changed from cooperating groups of the SPP 1239. The framework Should be capable of describe the magnetic-field-induced evolution of polycystalline and polytwinned microstrüctures, of discontinuous structures with different twin boundaries and compositions, of晶粒生长（浓缩）和磁驱动的晶界扩散和隔离模式的晶粒生长过程和磁驱动的晶粒边界运动的耦合过程。