Shulou(Shulou.com)12/24 Report--

CTOnews.com, December 2 (Xinhua) Chongqing University official account announced on Friday that the Huang Xiaoxu team and their collaborators from the School of Materials Science and Engineering of Chongqing University have made a new breakthrough in the field of nano-metal research using the independently developed three-dimensional transmission electron microscope (3D TEM) technology.

On December 1, Chongqing University, as the first completion unit and the first newsletter author unit, published the latest research results in the academic journal Science.

According to reports, the traditional electron microscope technology can only observe the surface of the sample, or observe the two-dimensional projection of the three-dimensional structure of the material, which greatly limits people's understanding of the microstructure of the material. In the past 20 years, the majority of scientists around the world have devoted themselves to the development of three-dimensional representation technology, and important progress has been made in the research and development of three-dimensional representation technology with spatial resolution in micron scale, and its application has promoted the important scientific development in the field of material science.

However, more and deeper material science problems require three-dimensional characterization technology at the nanometer level or even the atomic level, and it is a great challenge to improve the spatial resolution from micron to nanometer.

Huang Xiaoxu's team successfully developed a series of three-dimensional transmission electron microscope technology based on electron diffraction, which fills the gap of nano-scale three-dimensional electron microscope orientation imaging technology, and will greatly promote the development of three-dimensional material science. The team has been working hard for more than 10 years and has been supported by national key R & D programs and other projects.

The ▲ diagram shows the three-dimensional transmission electron microscope image of the dislocation interface in the metal, which is from Chongqing University. Using the three-dimensional orientation imaging technique, the three-dimensional electron microscope study of the plastic deformation of nano-metal is realized for the first time, and the abnormal phenomenon that the plastic strain of nano-metal can be recovered is found, and its physical nature is revealed.

The ▲ diagram shows the three-dimensional morphology and crystal orientation changes of nano-metal nickel before and after deformation. It is introduced that this new discovery develops the theory of plastic deformation of nano-metals, and will provide theoretical guidance for the research and development of advanced nanostructured materials, the prediction and control of the driving behavior of nano-materials and the functional optimization of micro-nano devices.

CTOnews.com attached the original text of the research results as follows:

3D microscopy at the nanoscale reveals unexpected lattice rotations in deformed nickel

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