Beijing time on June 9th news, according to foreign media reports, scientists have developed a new alloy that can be restored to its original shape after repeated bending 10 million times. The new alloy consists of nickel, titanium and copper, which breaks the repetitive conversion record of previous memory alloys. It is very flexible and has many potential uses, such as prosthetic heart valves, aircraft parts or a new generation of solid state refrigerators. Research on new alloys has been published in the journal Science. Although prior to the advent of new alloys, memory alloys have been used in fields such as surgery. For example, a blood vessel stent is squashed before being implanted in a human body, and is restored to a design shape to support a blood vessel after being implanted into a human body. However, these memory alloys have never fully achieved the desired results, and they have not become "high cycle fatigue" applications. The main researcher of the new alloy, Manfred Wuttig, a professor at the University of Maryland, told the BBC: "Similar memory alloys, like shape memory alloys used in minimally invasive surgery, can be recovered one or more times, but the number of restorations is very limited. Unusual, it can be called a leap." Professor Wuttig worked with colleagues at the University of Kiel in Germany to develop new alloys. The crystal structure is the key to the outstanding properties of the new alloy. The arrangement of nickel, titanium and copper atoms in the new alloy allows them to be continuously converted between two different arrangements. This conversion is called "phase change" and is the reason why the alloy restores its shape before bending. "Phase change" can occur either when the temperature changes or when the tension is released. In the paper, scientists specifically pointed out that Ti2Cu formed by titanium and copper simplifies the conversion process. Professor Wuttig said: "This special precipitate is completely compatible with two different crystal structures, so it ensures that the alloy can be completely converted from crystal structure A to B and then back to A." The small piece of alloy made by the team is only 1 square centimeter and less than 1 mm thick. Ten million cycle tests were completed under thermal and pressure conditions, respectively. Stress testing is not difficult, and automated testing can be done by simply purchasing or building a small stress-strain machine. Thermal testing is much more difficult. Scientists used a special furnace device to quickly complete 10 million heating and cooling of the sample. Each test takes a lot of time. Scientists use powerful microscopes and x-rays to examine changes in the crystal structure of the alloy. Professor Wuttig explained: "We do experiments in synchrotrons, and x-rays tell us the specific crystal structure." Professor Richard James of the University of Minnesota used "breakthrough" to describe the achievements of 10 million iterations. Professor James participated in the development of a previous memory alloy that can only be converted approximately 16,000 times. The study was also praised by Professor John Huber, a material expert at Oxford University: "This is an important finding. The general shape memory alloys exhibit considerable performance degradation after repeated conversions. Ten million cycles are The lower limit of the material requirements, the new alloy truly achieves high cycle fatigue, and has potential application value in a considerable number of fields." Professor Huber believes that the new alloy can be used for aircraft flaps or "control surfaces", but also for spacecraft solar energy. Deployment of the panels and prosthetic heart valves. Professor Wuttig and his colleagues are particularly interested in refrigeration. Professor Wuttig explained: “The compressor of a refrigerator compresses and expands the liquid by “phase changeâ€, and the record-breaking “endurance†of the alloy makes it possible to replace the liquid.†The small piece of alloy has undergone 10 million repeated recovery. The material was cut into thin dog bone shapes for stress testing. The small new alloy has an area of ​​1 square centimeter and is very thin. Fiber Optics In Concrete Floor,Fiber Optic Floor Lamp,Deck And Patio Light,Fibre Optic Floor Lamp Jiangxi Daishing POF Co.,Ltd , https://www.jxopticfibrelight.com
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Breakthrough memory alloy! Repeated bending 10 million times can still be restored!