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Cooling and Heating Characteristics of Ti-Ni Based Shape Memory Alloy Wire Actuators
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Ti-51Ni(at%) and Ti-40Ni-10Cu(at%) alloy wires with diameters of 0.3mm, 0.5mm and
0.7mm were prepared by drawing the alloy ingots fabricated by vacuum induction melting. Heating
rates of the wires were investigated by measuring changes in temperatures of them while applying
currents in the range of 1 A and 6 A to them and cooling rates were investigated by measuring changes
in temperatures of them after cutting currents. Heating rate increased with increasing the amount of
current, while cooling rate was kept constant. Both heating rate and cooling rate increased with
decreasing diameter of wire. This suggested that high amount of current and small wire diameter
were required for high heating and cooling rate. Comparing Ti-50Ni alloy wires with Ti-40Ni-10Cu
alloy wires, heating rates of the latter was faster than that of the former, although cooling rates were
almost same. This suggested that Ti-40Ni-10Cu alloy wires is better than Ti-50Ni alloy wires for the
applications requiring high actuating rates.
Trans Tech Publications, Ltd.
Title: Cooling and Heating Characteristics of Ti-Ni Based Shape Memory Alloy Wire Actuators
Description:
Ti-51Ni(at%) and Ti-40Ni-10Cu(at%) alloy wires with diameters of 0.
3mm, 0.
5mm and
0.
7mm were prepared by drawing the alloy ingots fabricated by vacuum induction melting.
Heating
rates of the wires were investigated by measuring changes in temperatures of them while applying
currents in the range of 1 A and 6 A to them and cooling rates were investigated by measuring changes
in temperatures of them after cutting currents.
Heating rate increased with increasing the amount of
current, while cooling rate was kept constant.
Both heating rate and cooling rate increased with
decreasing diameter of wire.
This suggested that high amount of current and small wire diameter
were required for high heating and cooling rate.
Comparing Ti-50Ni alloy wires with Ti-40Ni-10Cu
alloy wires, heating rates of the latter was faster than that of the former, although cooling rates were
almost same.
This suggested that Ti-40Ni-10Cu alloy wires is better than Ti-50Ni alloy wires for the
applications requiring high actuating rates.
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