科研之友
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摘要
This paper discusses three aspects that have not been looked into within mechanistic model for rationalizing observed behavior of nanocrystalline materials. (1) For the nano-materials with low energy barrier to emit the trailing partial after the leading partial, such as nanocrystalline Al (nc-Al), both partials extend intra-granularly in strengthening effect. (2) In the transition grain-size region between strengthening and softening, the coupled effect of intra-granular dislocation extension and grain boundary deformation contributes to flow stress. (3) Reformulating the non-homogeneous nucleation model, the activation volume is further examined.
- 出版日期2013-3-4
