Hu Zhiqing, Li Zhuo, Tang Kai, Wen Zi, Zhu Yongfu
Roll Forging Research Institute, Jilin University, Changchun 130022, China.
School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
Entropy (Basel). 2018 Apr 5;20(4):252. doi: 10.3390/e20040252.
A formula has been established, which is based on the size-dependence of a metal's melting point, to elucidate the atomic diffusion coefficient of nanostructured materials by considering the role of grain-boundary energy. When grain size is decreased, a decrease in the atomic diffusion activation energy and an increase in the corresponding diffusion coefficient can be observed. Interestingly, variations in the atomic diffusion activation energy of nanostructured materials are small relative to nanoparticles, depending on the size of the grain boundary energy. Our theoretical prediction is in accord with the computer simulation and experimental results of the metals described.
基于金属熔点的尺寸依赖性建立了一个公式，通过考虑晶界能的作用来阐明纳米结构材料的原子扩散系数。当晶粒尺寸减小时，可以观察到原子扩散活化能降低，相应的扩散系数增加。有趣的是，纳米结构材料的原子扩散活化能相对于纳米颗粒的变化较小，这取决于晶界能的大小。我们的理论预测与所描述金属的计算机模拟和实验结果一致。
