Mao Hong, Zeng Changlin, Zhang Zhikang, Shuai Xiong, Tang Sai
Hunan Institute of Science and Technology, College of Mechanical Engineering, Yueyang 414006, China.
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Materials (Basel). 2023 Sep 20;16(18):6307. doi: 10.3390/ma16186307.
An atomic-scale approach was employed to simulate the formation of precipitates with different lattice misfits in the early stages of the aging of supersaturated aluminum alloys. The simulation results revealed that the increase in lattice misfits could significantly promote the nucleation rate of precipitates, which results in a larger number and smaller size of the precipitates. The morphologies of the precipitates also vary with the degree of a lattice misfit. Moreover, the higher the lattice misfit, the earlier the nucleation of the second phase occurs, which can substantially inhibit the movement of dislocations. The research on the lattice misfit of precipitation can provide theoretical guidance for the design of high-strength aluminum alloys.
采用原子尺度方法模拟了过饱和铝合金时效早期不同晶格错配度析出相的形成过程。模拟结果表明，晶格错配度的增加可显著提高析出相的形核率，导致析出相数量增多、尺寸减小。析出相的形态也随晶格错配度的程度而变化。此外，晶格错配度越高，第二相的形核越早发生，这会显著抑制位错的运动。析出相晶格错配的研究可为高强度铝合金的设计提供理论指导。
