Hefei Institute of Materials Science, Chinese Academy of Sciences developed a new type of high-strength (copper) nanomaterial
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The research team of the Institute of Solids Research of the Hefei Institute of Physical Science of the Chinese Academy of Sciences recently successfully produced high-strength, high-thermal-stability Cu/Ta nano-multilayers with high thermal stability. This achievement breaks through the instability problem of traditional nanomaterials under high temperature conditions, and provides ideas for the design of next-generation nuclear power plant structural materials.
Nanostructured materials, because of their high strength and rich interface, are considered ideal candidates for next-generation nuclear power devices. However, the traditional nanostructured materials are unstable in structure and properties under extreme conditions such as high temperature and strong radiation. Therefore, it is always a difficult problem to study the preparation of nanostructured materials with high strength and high stability at the same time.
The research team of the Institute of Nuclear Materials, Solid Internal Destruction and Solid Defects Research, effectively overcomes the plastic instability and edge cracking problems that occur during the accumulative roll-bonding process with the large plastic deformation method. For the first time, a layer of 12,288 layers was successfully prepared. The minimum single-layer film thickness is 50 nanometers high-interface copper-cerium nano-multilayer film bulk. The microstructure shows that the copper-cerium nano-multilayers have a continuous layered structure and the copper and germanium interfaces are straight and clear. Mechanical test results show that the strength of the initial raw material is 5 times. More importantly, this material also has very good high-temperature thermal stability. After annealing at 500Â°C for 1 hour, the hardness does not change. After annealing at 600Â°C for 1 hour, the hardness only decreased by 6.6%. The successful preparation of this high-strength, high-heat-stability material provides new ideas for material design under extreme conditions, and lays the foundation for further research on nano-multilayers of copper-vanadium, copper-tungsten, chromium-tungsten, and other bulk materials.
The relevant research results have recently been published on the authoritative journal Acta Materi-alia in the international material world.
May 03, 2016 Source: Anhui Provincial Department of Science and Technology
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