Magnetostrictive Galfenol (Fe-Ga) is a promising new active material. Single crystals of Galfenol have been shown to
exhibit up to 400 ppm magnetostrictive strains with saturating fields of several hundred oersteds. Its robustness and
ability to actuate in either tension or compression allows for new actuator and sensor designs. However, due to the high
permeability of Galfenol, it needs to be in thin sheet form for many device applications to minimize eddy current losses.
Work is underway to develop conventional rolling processes to produce large quantities of thin Galfenol sheet, while
retaining a preferred <100> crystallographic texture to optimize magnetostrictive performance. Knowledge of
deformation behavior at elevated temperature is crucial to understanding formability and crystallographic texture
evolution during rolling. In this work, the high-temperature plasticity and the deformation behavior of polycrystalline
Galfenol were investigated using conventional axial compression tests and rolling experiments. As the temperature
increased, significant softening of the material occurred in the temperature range from about 450°C to 800°C. The
results also suggested that significant dynamic recovery and recrystallization occurred during deformation at above
800°C.
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