|About this Abstract
||Materials Science & Technology 2019
||Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
||Integrated Heat Transfer and Material Model to Predict Magnetic Field-induced Strain in an Additively Manufactured Magnetic Shape Memory Alloy
||Yao Xu, Sneha Prabha Narra
|On-Site Speaker (Planned)
Magnetic shape memory alloys such as Ni-Mn-Ga, show a reversible magnetic field-induced strain (MFIS). One of the factors contributing to this MFIS is the motion of twin boundaries in the martensitic phase. Laser powder bed fusion (LPBF) is an emerging technology capable of fabricating materials with complex geometries and tailored microstructures. The potential of applying LPBF to manufacture Ni-Mn-Ga poses challenges related to parameter optimization for microstructure control. In this work, a finite element model is developed to estimate the thermal history for determining the microstructure evolution during solidification, as validated by a single melt track experiment. Furthermore, a kinetic model is proposed to capture the magneto-mechanical deformation of polycrystalline Ni-Mn-Ga for different microstructures. By combining these two models, the relationship between LPBF processing parameters (beam power and travel speed) and MFIS can be defined. Based on that, the processing parameters can be optimized for higher MFIS.