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Thermo-mechanical Characteristics of High Temperature NITINOL Shape Memory Alloy  

Yun, Seong-Ho (Dept.of Machanical Engineering, Kumoh National Institute of Technology)
Sridhar Krishnan (Dept. of Aero. & Astro. Eng., Univ. of Illinois at Urbana-Champaign)
Scott R. White (Dept. of Aero. & Astro. Eng., Univ. of Illinois at Urbana-Champaign)
Publication Information
Journal of the Korean Society for Precision Engineering / v.19, no.10, 2002 , pp. 52-59 More about this Journal
Abstract
The thermo-mechanical characteristics of high temperature NITINOL shape memory alloy were evaluated using DSC with small samples and DMA with three-point bending specimens. The shape memory alloy of 54.4Ni/45.5Ti wt.% was used so that the phase transformation temperatures were in the range of 50~11$0^{\circ}C$. Two types of sample were tested in the experiments corresponding to as-received and annealed conditions. Simple beam bending theory was used to calculate the dynamic moduli of the shape memory alloy. According to the results, a large discrepancy in transformation temperatures was found between DSC and DMA techniques. Annealing treatment was found to suppress the R-phase transformation during cooling and the secondary plateau in the austenite transformation. Such a heat treatment was also significantly influenced to raise the transformation temperatures and the moduli of the shape memory alloy.
Keywords
Thermo-mechanical characteristics; High temperature shape memory alloy; Phase transformation temperature; Austenite transformation; Dynamic moduli; Annealing treatment;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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