Superelasticity and Corrosion Behavior of 50Ti–(45-X)Ni–5Cu

Abstract

In this study superelasticity and corrosion characteristics of 50Ti–(45-X)Ni–5Cu–XMo alloys have been investigated by means of electrical resistivity measurements, X-ray diffraction, tensile tests, polarization tests, and optical microscopy. Substitution of Mo for Ni in a Ti–45Ni–5Cu alloy induces the B2–B19 transformation and the stability of the B19 martensite increases with an increase in Mo content. Superelastic recovery of 50Ti–(45-X)Ni– 5Cu–XMo alloys increases from 33 to 91% with an increase in Mo-content from 0 to 0.5%. The 50Ti–(45-X)Ni–5Cu–XMo alloys show small stress hysteresis below 100 MPa. The pitting potential of 50Ti–(45-X)Ni–5Cu–XMo alloys also increases with the increase in Mo content.

Keywords

Ti-Ni-Cu-Mo alloys superelasticity B2-B19 transformation critical stress for slip deformation pitting potential

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References

Andreasen, G.F. and Brady, P.R. 1972. “A Use Hypothesis for 55 Nitinol Wire for Orthodontics,” Angle Orthod., 42(2): 172–177 .

Asai, M. and Suzuki, Y. 2000. “Applications of Shape Memory Alloys in Japan,” Mater. Sci. Forum, 327-328: 17–22 .

Edie, J.W. , Andreasen, G.F. and Zaytoun, M.P. 1981. “Surface Corrosion of Nitinol and Stainless Steel Under Clinical Conditions,” Angle Orthod., 51(4): 319–324 .

Ilevbare, G.O. and Burstein, G.T. 2001. “The Role of Alloyed Molybdenum in the Inhibition of Pitting Corrosion in Stainless Steels,” Corrosion Science, 43(3): 485–513 .

Mohlin, B. , Muller, H. , Odman, J. and Thilander, B. 1991. “Examination of Chinese Ni-Ti wire by a Combined Clinical and Laboratory Approach,” Euro J. Orthod., 13: 386–391 .

Nam, T.H. , Saburi, T. , Kawamura, Y. and Shimizu, K. 1990a. “Shape Memory Characteristics Associated With the B2 <-> B19 and B19 <-> B190 Transformations in a Ti–40Ni–10Cu (at.%) Alloy,” Mat. Trans. , JIM 31(4): 262–269 .

Nam, T.H. , Saburi, T. and Shimizu, K. 1990b. “Copper-Content Dependence of Shape Memory Characteristics in Ti–Ni–Cu Alloys,” Mater. Trans. , JIM 31(11): 959–967 .

Nam, T.H. , Noh, J.P. and Hung, D.W. 2001. “The B2–B19–B190 Transformation in a Ti–44.7Ni-5Cu-0.3Mo(at.%) Alloy,” J. Mater. Sci. Letter, 20(8): 713–715 .

Nam, T.H. , Noh, J.P. , Hur, S.G. , Kim, J.S. and Kang, S.B. 2002. “Phase Transformation Behavior and Shape Memory Characteristics of Ti-Ni-Cu-Mo Alloys,” Mater. Trans., 43(5): 801–808 .

10.

Rondelli, G. 1996. “Corrosion Resistance Tests on NiTi Shape Memory Alloy,” Biomaterial, 17(20): 2003–2008 .

11.

Saburi, T. , Nenno, S. , Nishimoto, Y. and Zeniya, M. 1986. “Effects of Thermo-Mechanical Treatment on the Shape Memory Effect and the Pseudoelasticity of Ti–50.2Ni and Ti–47.5Ni–2.5Fe Alloys,” Tetsu to Hagane, 72(6): 571–578 .

12.

Shugo, Y. , Hasegawa, F. and Honma, T. 1981. “Effects of Copper Addition on the Martensitic Transformation of TiNi Alloy,” Bull. Res. Inst. Mineral Dress. Metall., 37(1): 79–88 .

13.

Strnadel, B. , Ohashi, S. , Otsuka, H. , Miyazaki, S. and Ishihara, T. 1995. “Effect of Mechanical Cycling on the Pseudoelasticity Characteristics of Ti–Ni and Ti–Ni–Cu Alloys,” Mater. Sci. Eng., A203(1–2): 187–196 .

14.

Tan, S.M. and Miyazaki, S. 1997. “Ti-content Dependence of Transformation Pseudoelasticity Characteristics of Tix Ni(92-x) Cu8 Shape Memory Alloys,” Mater. Sci. Eng., A237(1): 79–86 .

Superelasticity and Corrosion Behavior of 50Ti–(45-X)Ni–5Cu–XMo (at.%) Alloys

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