Abstract
Pulsed magnetic field-induced motion of single twin boundaries in Ni–Mn–Ga 5M martensite has been studied using laser vibrometry technique. Maximum actuation velocities of 0.25m/s for Type I and 2m/s for Type II twin boundary motion were directly observed, which corresponds to velocities of 4.2m/s and 33m/s for these types of twin boundaries moving inside the crystal. Actuation response time of 2μs and actuating acceleration of about 2×105m/s2 for Type II boundary were achieved. The difference between Type I and Type II boundaries and the limiting role of inertia in twin boundary motion are discussed.
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