Journal Article

Ferrous Polycrystalline Shape-Memory Alloy Showing Huge Superelasticity

Ishida, K, Sutou, Y, Omori, T, Tanaka, Y, Himuro, Y, Kainuma, R

2010

Overview

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.

• Publisher: American Association for the Advancement of Science,The American Association for the Advancement of Science
• Subject: Alloys / aluminum / Applied sciences / Betting / copper / Crystallography / Ductility / elasticity (mechanics) / Elasticity. Plasticity / Exact sciences and technology / Grain boundaries / Magnetization / Martensite / Martensitic transformation / Materials / Materials science / Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology / Mechanics / Metals. Metallurgy / Room temperature / tensile strength / Tensile stress / zinc