The effects of shape-setting on transformation temperatures of pseudoelastic shape memory alloy springs
Since shape memory alloy (SMA) wires can hardly ever be reliably employed under compressive loadings, SMA springs are developed as axial actuators with the ability of withstanding both tension and compression. In this paper, shape memory alloy helical springs are produced by shape-setting two types...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
H. : ĐHQGHN
2020
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| Subjects: | |
| Online Access: | http://repository.vnu.edu.vn/handle/VNU_123/76713 https://doi.org/10.1016/j.jsamd.2019.10.005 |
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| Institution: | Vietnam National University, Hanoi |
| Language: | English |
| Summary: | Since shape memory alloy (SMA) wires can hardly ever be reliably employed under compressive loadings, SMA springs are developed as axial actuators with the ability of withstanding both tension and
compression. In this paper, shape memory alloy helical springs are produced by shape-setting two types
of wires: one with shape memory effect (SME) and the other with pseudoelasticity (PE) at the ambient
temperature. Phase transformation temperatures of the produced springs are measured by differential
scanning calorimetry (DSC), and the influences of effective parameters including cold work, heat
treatment temperature and duration, and cooling rate are investigated on transformation temperatures
of the products. The results show that phase transition temperatures of the fabricated springs can be
tuned by performing cold work and by adjusting temperature and duration of the conducted heat
treatment as well as the subsequent cooling rate. It is found that transformation temperatures of the
springs fabricated using the SME wire increase as the heat treatment temperature increases. However,
for samples manufactured using PE wire, transformation temperatures first increase and then decrease
with the increase in the heat treatment temperature. An increase in the cooling rate leads to a decrease
in the austenite final temperature (Af), and an increase in the extent of cold work leads to the increase in
transformation temperatures especially Af. |
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