Domain microstructure evolutions under applied magnetic field in magnetic shape memory alloys are investigated by phase field micromagnetic microelastic modeling. The computer simulations reveal respective roles of elastic interaction, magnetic interaction, and their competition in the coupled magnetic and elastic domain processes. It is observed that different relative strengths of elastic interaction with respect to magnetic interaction lead to different domain evolution pathways and different twin boundary behaviors, including field-induced twin boundary displacement, deformation, and annihilation. Distinct twin boundary behaviors driven by magnetic field from that driven by mechanical stress are discussed.

Topics
Magnetic ordering, Magnetic energy, Magnetic fields, Maxwell equations, Strain measurement, Alloys, Mechanical stress, Smart materials, Crystal twinnings, Computer simulation
© 2011 American Institute of Physics.
2011
American Institute of Physics
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