Ferrous Polycrystalline Shape-Memory Alloy Showing Huge Superelasticity -- Tanaka et al. 327 (5972): 1488 -- Science

Ferrous Polycrystalline Shape-Memory Alloy Showing Huge Superelasticity -- Tanaka et al. 327 (5972): 1488 -- Science: "Shape-memory alloys, such as Ni-Ti and Cu-Zn-Al, show a large reversible strain of more than several percent due to superelasticity. In particular, the Ni-Ti–based alloy, which exhibits some ductility and excellent superelastic strain, is the only superelastic material available for practical applications at present. We herein describe a ferrous polycrystalline, high-strength, shape-memory alloy exhibiting a superelastic strain of more than 13%, with a tensile strength above 1 gigapascal, which is almost twice the maximum superelastic strain obtained in the Ni-Ti alloys. Furthermore, this ferrous alloy has a very large damping capacity and exhibits a large reversible change in magnetization during loading and unloading. This ferrous shape-memory alloy has great potential as a high-damping and sensor material."