The scientists who made Nitinol "transform" into a super-strong elastic material are researchers from the National Institute for Materials Science in Japan, and this is also a new process they developed.This material is as strong as steel, but 20 times more ductile than steel, and is expected to be used to make deformable wings. The relevant paper was published in the latest issue of Nature magazine.Imagine an airplane flying in the air, and the wings can adjust their length as the flight speed changes to make better use of aerodynamics. To realize this dream, engineers have been looking for a material that is both flexible and hard and can withstand various harsh environments during flight.Nitinol memory alloy has many special properties, such as superelasticity, memory effect, biocompatibility and ductility. Its ductility is better than other metals, and the memory effect can "remember" the previous shape. When it is deformed, it only needs to be heated or powered to reach its own phase change temperature to restore it to its original "appearance".
Although scientists have previously developed some nitinol shape memory alloys with strong elasticity and durability, these materials can only show these properties at specific temperatures, limiting their application range. The latest research has developed a new three-step process: first, severely deform the sample and stretch it by 50%; then, briefly heat it to 300°C; finally, stretch it by another 12%. The results show that the new material can withstand 18,000 times the atmospheric pressure, has the same strength as steel, and is about 20 times more elastic than steel. In addition, the new material maintains its performance at a temperature range of -80~80°C. Researchers say that the new material is not only a metal, but also a glass. Although glass is usually brittle, the unique arrangement of molecules in this new type of glass allows it to deform without breaking under pressure.
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