本文计算了纳米微晶材料在不同扩散条件下的扩散激活能、扩散系数频率因子，由此得到了相应的自扩散系数，通过与实测自扩散系数比较发现，纳米晶体中的原子扩散为晶界空位型扩散与晶界间断分布的空隙内表面直接扩散的复合型扩散
The activation energies,the preexponential factors and the corresponding self-diffusion coefficients for a nanocrystalline material in various diffusion conditions were calculated. Based on comparison of the calculated self-diffusions with the experimentally measured one, it is suggested that the diffusion model in nanocrystals is a complex one with the combination of the boundary diffusion by the vacancy mechanism and the internal surface diffusion of atoms along internal surfaces of boundary voids. CHEN Da, professor, Department of Materials Science, Shanghai Jiaotong University, Shanghai 200030
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| [10] | GleiterH．ProgMaterSci,1989 |
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