This newspaper (Reporter He Rui) A scientific research team composed of Beijing universities pioneered the idea of "borrowing dislocations" to make ceramics have tensile plasticity like metals, realizing the first time in the world that ceramics have tensile plasticity. Room temperature tensile plasticity. The results were recently published in the international journal Science.
Recently, the State Key Laboratory of New Metal Materials at the University of Science and Technology Beijing and the School of Materials Science and Engineering at Beijing University of Technology jointly released this major scientific research breakthrough. According to the research team, ceramic materials have become key materials for the development of many high-tech fields due to their excellent properties such as high temperature resistance and corrosion resistance. However, it is difficult for ceramics to undergo plastic deformation like metals, which seriously restricts the further development and application of materials. Chen Kexin, a researcher at the State Key Laboratory of New Metal Materials at Beijing University of Science and Technology, explained that due to the extremely strong ionic or covalent bond characteristics, the dislocation nucleation energy inside ceramic materials is extremely high. This means that ceramic materials often break before dislocations occur and plastic deformation occurs.
In this regard, the scientific research team pioneered the idea of "borrowing dislocations": if dislocations in metals are "lent" to ceramics, ceramics may be as plastic as metals. Therefore, they designed an orderly bonded interface between metal and ceramics, which effectively improved the bonding strength of the interface through chemical bonding, thereby ensuring that the interface would not crack. This ordered interface also ensures the continuity of the metal and ceramic crystal planes, allowing metal dislocations to be easily "borrowed" into the interior of the ceramic.
Repeated tests show that through this strategy, the tensile deformation of ceramics can reach 39.9%, and the strength is about 2300Mpa (Megapascals), breaking the traditional understanding that "ceramics cannot have tensile plasticity". This achievement marks that my country has made important scientific research progress in the field of ceramic materials and brings more possibilities for the future application of ceramic materials. At present, this scientific research project has been supported by key projects of the National Natural Science Foundation of China.
