Thermomechanical behavior of Cu-Al-Ni single crystal high-temperature shape memory alloy: reorientation

Steve Trigwell; Ganesh Kumara Kannarpady; Abhijit Bhattacharyya; Sergei Pulnev; Ivan Vahhi

doi:10.1117/12.539834

21 July 2004 Thermomechanical behavior of Cu-Al-Ni single crystal high-temperature shape memory alloy: reorientation

Steve Trigwell, Ganesh Kumara Kannarpady, Abhijit Bhattacharyya, Sergei Pulnev, Ivan Vahhi

Proceedings Volume 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics; (2004) https://doi.org/10.1117/12.539834
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

Copper-Aluminum-Nickel (Cu-Al-Ni) single crystal shape memory alloy (SMA) wires show great potential in actuator applications due to their high stress-free transformation temperatures and superior mechanical stability compared to common Nickel-Titanium SMAs. In this paper, Cu-13.3%Al-4%Ni (wt %) single crystal wires with stress-free transformation temperatures in the range of 80° C to 120° C were subjected to stress cycling tests at ambient temperatures up to 100° C at low deformation rates. Stress/strain curves up to 9% and 3% strain in the range of the transformation temperatures point to the possibility of phase transformation by detwinning. However, the residual overall strain after unloading decreased significantly at 60° C for both 3% and 9% strains. Accumulation of plastic deformation was observed for subsequent cycles.

Citation Download Citation

Steve Trigwell, Ganesh Kumara Kannarpady, Abhijit Bhattacharyya, Sergei Pulnev, and Ivan Vahhi "Thermomechanical behavior of Cu-Al-Ni single crystal high-temperature shape memory alloy: reorientation", Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); https://doi.org/10.1117/12.539834

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