Microstructure and Properties of Shape Memory Alloys

Dear Colleagues,

Shape memory alloys (SMAs) are a fascinating category of materials with the unique ability to recover large inelastic strains by heating or unloading due to a reversible martensitic transformation. The history of SMAs dates back to the 1930s when the shape memory effect was first observed in a gold–cadmium alloy. Subsequently, in the 1950s, researchers at the U.S. Naval Ordnance Laboratory rediscovered the shape memory effect and explored its potential applications. The 1960s marked a pivotal era with the development of the nickel–titanium alloy, Nitinol, by the Naval Ordnance Laboratory, heralding a new era of understanding and utilization of shape memory alloys. Since then, significant advancements have been made in the field, leading to the discovery of new alloy compositions, refined processing techniques, and a myriad of practical applications.

These shape memory alloys are utilized across diverse sectors including aerospace, automotive, biomedical, solid-state refrigeration and robotics due to their exceptional properties like superelasticity, elastocaloric effect and shape memory effect. Presently, shape memory alloys remain a focal point of research and innovation, with ongoing endeavors aimed at creating novel materials with enhanced properties and delving into fresh applications across various industries.

Dr. Yuhai Qu
Dr. Hehe Zhang
Dr. Patrice Berthod
Guest Editors

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