Li Qiangqiang

本報瀋陽4月8日電 (記者吳月輝、郝迎燦)近期，中國科學院金屬研究所瀋陽材料科學國家研究中心盧磊研究員團隊領銜的一項最新科研成果，提出了一種全新的結構設計思路，在成功讓金屬材料保持高強度、高塑性的同時，大幅提升其穩定性。這項成果於日期：4月4日淩晨在國際學術期刊《科學》發表。

The fatigue failure of metal materials under cyclic load is a potential safety hazard of major projects. "The reason for the instability of metal materials is that there is a dislocation defect in the metal, when subjected to a unidirectional fluctuating external force, the dislocation will move and accumulate, gradually forming irreversible deformation and cracks, and eventually leading to a sudden fracture of the metal, which is also called ratchet damage." Lu Lei explained.

By controlling the specific process parameters of metal reciprocating torsion, researcher Lu Lei's team introduced a spatial gradient sequence dislocation cell structure into the metal materials, which can hinder the movement of dislocations, increase the yield strength of materials by 6.0 times, and greatly reduce the average ratchet deformation rate, breaking through the bottleneck that the anti-ratchet damage performance of traditional structural materials is difficult to improve.

According to reports, this achievement has broken through the problem that it is difficult to achieve both strength, plasticity and stability of metal materials, and has shown a wide range of application potential in a variety of engineering alloy materials, which is expected to provide an important guarantee for the long life and high reliability service of key components in extreme environments.

People's Daily (12/0/0 0 Edition)