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What is nanocrystalline material

2021-04-28 14:55

Nanocrystalline material refers to a crystalline material with at least one dimension in the nanometer scale in the three-dimensional space. Its grain size is about 1-250 nanometers. A distinctive feature of this material is that most of its atoms are located in the grain boundary region. This unique structural feature makes nanocrystals a new material different from ordinary polycrystalline and amorphous solids, in which the interface becomes a structural component that cannot be ignored.


Nanocrystalline materials are classified into single-phase or multi-phase single-crystalline or multi-crystalline materials. In a single crystal material, any region has the same crystal lattice direction, while a polycrystalline material consists of many regions or crystal grains with different crystal lattice directions, and the crystal grains are divided by the grain boundary phase. Due to the fine grains of nano-polycrystalline materials, the internal interface composed of grain boundaries, phase boundaries, or domain boundaries has a high content, which significantly affects the physical and mechanical properties of nanocrystals, making them have what traditional materials do not have. Excellent characteristics. Compared with traditional coarse-grained materials (grain size range is about 10-300 microns), nano-grained materials have very excellent physical, mechanical and chemical properties, such as high strength or hardness, and good thermal stability , Enhanced diffusion performance and thermal conductivity properties.


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