科研之友
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摘要
The optimality of nanotwinned structures in imparting maximum strength and stability has been investigated by performing atomistic simulations of dislocation interactions with various types of grain boundaries. By developing an understanding of the mechanism of the instability, we predict that nanocrystalline metals with grain sizes below 50 /- 10 nm or 70 /- 10 nm (in Cu) are inherently unstable at 0 or 300 K, respectively, in contrast to nanotwinned face-centered cubic structures which are stable and optimal.
- 出版日期2009-4
- 单位美国弗吉尼亚理工大学(Virginia Tech)
