The High Temperature Connecting Strength and Thermal Stability of Ti44Ni47Nb9 SMA Pipe Coupling
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.
Jian-Feng Nie and Allan Morton
W. Jin "The High Temperature Connecting Strength and Thermal Stability of Ti44Ni47Nb9 SMA Pipe Coupling", Materials Science Forum, Vols. 654-656, pp. 2083-2086, 2010