Improving the ductility of nanocrystalline bcc metals

被引：31

作者：

Farkas, D ^{[1
]}

Hyde, B ^{[1
]}

机构：

[1] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA

来源：

NANO LETTERS | 2005年 / 5卷 / 12期

关键词：

D O I：

10.1021/nl0515807

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nanocrystalline metals present extremely high yield strengths but limited ductility. Using atomistic simulations, we show that the fracture resistance of bcc nanocrystalline materials increases with decreasing grain size below a critical grain size. There appears to be a "most brittle" grain size corresponding to the "strongest size" that has been postulated. Impurities that strengthen the grain boundaries can improve ductility significantly for the relatively larger grain sizes, whereas ductility decreases for the smallest grain sizes.

引用

页码：2403 / 2407

页数：5

共 18 条

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