The High Temperature Connecting Strength and Thermal Stability of Ti₄₄Ni₄₇Nb₉ SMA Pipe Coupling

Abstract:

The creeping properties of Ti44Ni47Nb9 shape memory alloy (SMA) were studied at 300°C. The connecting strength, deformation and thermal stability of the connected units were investigated under constant load and high temperature, and the units were composed of SMA pipe couplings and 16×1.5mm 1Cr18Ni9Ti tubes. The results indicated that (1) Ti44Ni47Nb9 alloys had excellent creeping properties at 400MPa stress and 300°C; (2) the connected units had good connected properties and thermal stabilities at 8445N axial tensile load and 400°C; (3) the essence of high temperature relaxation of the connected units was that the strength of SMA pipe couplings and connected tubes reduced with increasing temperature, and the pipe couplings had relative displacement to the connected tubes under axial tensile load.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 2083-2086
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.2083
• Online since: June 2010
• Authors: Wei Jin
• Keywords: 1Cr18Ni9Ti Tube, Connecting Strength, High-Temperature, Pipe Coupling, Thermal Stability, Ti₄₄Ni₄₇Nb₉

References

[1] T. W. Duerig and K. N. Melton, in: Application of Shape Memory Alloy in the USA, edited by N. Igata et al., Chiba-shi, Japan (1989).

[2] Raychem Ltd: Aircraft Engineering, Vol. 62 (1990), p.10.

[3] Peter Lewis: Aircraft Engineering and Aerospace Technology, Vol. 69 (1997), p.31.

[4] J. Simpson, K. N. Melton and T. W. Duerig, U. S. Patent: 4 770 725. (1988).

[5] K. N. Melton, J. Simpson and T. W. Duerig, in: A New Wide Hysteresis NiTi Based Shape Memory Alloy and its Applications, edited by The Japan Institute of Metal, Nara, Japan (1986).

[6] J. L. Proft and T. W. Duerig, in: The Mechanical Aspects of Constrained Recovery, edited by Butterworth-Heinemann Ltd, London, UK (1990).