Martensitic transformation and reponse characteristics in bias-SMA spring actuators with thermal cycling
- Martensitic transformation and reponse characteristics in bias-SMA spring actuators with thermal cycling
- 지광구; 최원일; 김경훈; 장우양
- Shape memory actuator; Thermal cycling; Recovery force; Recovery displacement; Heat treatment
- Issue Date
- Advanced materials research
- VOL 488-489, 118-123
- The effect of thermal cycling on the martensitic transformation and response characteristics
has been studied in bias-SMA spring actuators aged at 350 °C ~ 500 °C. As the number of thermal
cycling increases, the Ms temperature of the SMA spring showing only B2→B19' martensitic
transformation by aging at 350 or 500 °C goes down. However, SMA spring in which B2→R→B19'
martensitic transformation taken place by aging at 400 or 450 °C shows multi-step transformations
i.e., M1 and M2 transformations with thermal cycling. The heat flow of M2 transformation increases
while the transformation temperature difference between M1 and M2 transformations is enlarged as
the number of cycling increases. The recovery displacement and force of bias-SMA spring actuator
increase up to the 10th cycle and the extent of increase is the largest at aging temperature of 500 °C.
However, both recovery properties decrease after the 103 or 104 cycles, while the decreasing tendency
becomes larger with a rise in aging temperature. Such a change in recovery characteristics of
bias-SMA spring actuator with thermal cycling is discussed in connection with training effect or
lattice defects introduced during thermal cycling.
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