Cu-Al-Ni Shape Memory Alloy

Cu-Al-Ni is a copper-based shape memory alloy (SMA) that exhibits both the one-way shape memory effect and superelastic behavior, allowing it to recover large deformations upon heating or unloading. It is used in actuators, sealing devices, and vibration dampers where its ability to transform between crystalline phases at relatively moderate temperatures provides reliable, reversible motion without external power. Engineers select this alloy over NiTi alternatives when lower cost, higher thermal conductivity, or operation in the 150–200 °C range is required, though it offers narrower temperature windows and greater thermal hysteresis than nickel-titanium counterparts.