Material Chinese researchers report on new, exotic alloy

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As hard as  steel yet as flexible as rubber: Scientists in China report a new alloy that combines these properties, potentially enabling future technologies.

Chinese researchers have developed an "exotic" material that combines the hardness of steel with the flexibility of plastics. This is reported by a team of material scientists from Xi'an in a paper published in the online edition of the science magazine "Nature." In their otherwise dryly written article, brimming with figures, they themselves use the word "exotic." This is likely due to the fact that the novel metal alloy, because of its properties, is envisaged for a range of applications that extend from deformable airplane wings and super-hard robot muscles to entirely new types of prostheses. This breakthrough represents a significant advancement in materials science, potentially leading to revolutionary changes in various industries by combining previously mutually exclusive properties of strength and flexibility.

Here we report on a Ti-50.8 at.% Ni strain-glass alloy, which exhibits a combination of an ultra-high yield strength of σy ≈ 1.8 GPa and an ultra-low modulus of elasticity of E ≈ 10.5 GPa, coupled with a super-large elastic strain of about eight percent.

from the essay “A polymer-like metal alloy of ultra-high strength”

Nickel-titanium alloy combines hardness and flexibility

The material is a nickel-titanium alloy consisting precisely of 50.8 percent nickel and 49.2 percent titanium, which is then "kneaded" through a three-stage thermomechanical process. The material properties resulting from the individual steps are detailed by the researchers in Nature, and you can read more about their findings and the potential applications of this "polymer-like ultrahigh-strength behavior" material by following this link: Nature Article.

Morphing conceivable

If this new material can indeed be produced relatively easily in large quantities, as the scientists claim after their initial experiments, it would render a long-standing maxim of materials science obsolete: that the hardness of steel is incompatible with the flexibility and repeated deformability of plastics or rubber.

"The emergence of this new type of metal material, which is as strong as ultra-strong steel yet as flexible as polymer materials, could bring a whole spectrum of future technologies from distant science fiction into reality," quoted the Chinese science newspaper Keji Ribao, citing a researcher from Xian named Xu Zhizhi.

Although it is still a long journey from the invention of this alloy to its industrial applications, Chinese science magazines are already eagerly debating potential examples of these "science fiction" technologies. One concept being discussed is the construction of futuristic airplane wings that can change shape during flight ("morphing") to enhance aerodynamics or efficiency under different conditions. Such wings would also be highly sought after in space applications. This kind of adaptive technology could revolutionize aviation and space travel, offering new levels of performance and fuel efficiency.

Initial promising tests have been conducted

Indeed, both NASA and manufacturers like Airbus have long been researching wings that can change shape, according to media reports. However, designers require a flexible material that can be transformed into a new shape without using excessive driving energy while maintaining its structural rigidity. Additionally, the process must be repeatable under extreme conditions without leading to material fatigue. The development of materials like the mentioned nickel-titanium alloy could potentially meet these requirements by offering exceptional flexibility and durability, thus advancing the feasibility of morphing wings for aircraft and spacecraft. This innovation could significantly impact the efficiency and functionality of future aerospace designs.

The researchers from Jiaotong University in Xi'an, in the northwest of the People's Republic of China, assert that their new alloy meets precisely these requirements. According to the science portal Zhongguo Keji Xinwen, the material retains its "strong yet flexible" properties within a temperature range from minus 80 to plus 80 degrees Celsius. Furthermore, in initial experiments, even after five million bending tests, the alloy exhibited "no signs of fatigue fractures." This performance highlights the material's potential for applications in environments that require high durability and repeated deformations, such as aerospace engineering, where materials must withstand varied and extreme conditions without failure.

What else is possible

"Imagine this: You are watching a risky rescue operation. A slender, snake-like robot effortlessly winds its way through the twisted remains of a collapsed building. Its muscles, made from this new alloy, are strong enough to lift heavy debris yet flexible enough to squeeze through tight spaces," writes "The China Academy" portal. This scenario illustrates the potential revolutionary applications of the nickel-titanium alloy in robotics, particularly in search and rescue missions where maneuverability and strength are crucial. The alloy's unique properties could significantly enhance the capabilities of robots used in emergency response, making them invaluable tools in disaster recovery and saving lives.

"Next-generation prosthetics" or innovative suits for astronauts that offer a new dimension of protection and mobility during spacewalks have also become conceivable with this new material, according to Chinese technical media.

*Henrik Bork, long-time China correspondent for the German 'Süddeutsche Zeitung' and the 'Frankfurter Rundschau', is the Managing Director at Asia Waypoint, a consulting agency specializing in China, based in Beijing. "China Market Insider" is a project of the Vogel Communications Group