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http://dx.doi.org/10.4041/kjod.2010.40.1.40

Comparison of transition temperature range and phase transformation behavior of nickel-titanium wires  

Lee, Yu-Hyun (Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University)
Lim, Bum-Soon (Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University)
Lee, Yong-Keun (Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University)
Kim, Cheol-We (Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University)
Baek, Seung-Hak (Department of Orthodontics, School of Dentistry, Seoul National University)
Publication Information
The korean journal of orthodontics / v.40, no.1, 2010 , pp. 40-49 More about this Journal
Abstract
Objective: The aim of this research was to evaluate the mechanical properties (MP) and degree of the phase transformation (PT) of martensitic (M-NiTi), austenitic (A-NiTi) and thermodynamic nickel-titanium wire (T-NiTi). Methods: The samples consisted of $0.016\;{\times}\;0.022$ inch M-NiTi (Nitinol Classic, NC), A-NiTi (Optimalloy, OPTI) and T-NiTi (Neo-Sentalloy, NEO). Differential scanning calorimetry (DSC), three-point bending test, X-ray diffraction (XRD), and microstructure examination were used. Statistical evaluation was undertaken using ANOVA test. Results: In DSC analysis, OPTI and NEO showed two peaks in the heating curves and one peak in the cooling curves. However, NC revealed one single broad and weak peak in the heating and cooling curves. Austenite finishing ($A_f$) temperatures were $19.7^{\circ}C$ for OPTI, $24.6^{\circ}C$ for NEO and $52.4^{\circ}C$ for NC. In the three-point bending test, residual deflection was observed for NC, OPTI and NEO. The load ranges of NC and OPTI were broader and higher than NEO. XRD and microstructure analyses showed that OPTI and NEO had a mixture of martensite and austenite at temperatures below Martensite finishing ($M_f$). NEO and OPTI showed improved MP and PT behavior than NC. Conclusions: The mechanical and thermal behaviors of NiTi wire cannot be completely explained by the expected degree of PT because of complicated martensite variants and independent PT induced by heat and stress.
Keywords
Transition temperature range; Phase transformation; Ni-Ti wires;
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