The ultra-small strongest grain size in nanocrystalline Ni nanowires

被引：16

作者：

Cao, Ronggen ^{[1
]}

Deng, Chuang ^{[2
]}

机构：

[1] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

[2] Univ Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada

来源：

SCRIPTA MATERIALIA | 2015年 / 94卷

关键词：

Nanocrystalline; Nanowire; Grain size; Plasticity; HALL-PETCH BREAKDOWN; PLASTICITY; METALS;

D O I：

10.1016/j.scriptamat.2014.09.002

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Here we report the finding that the strongest grain size to achieve the maximum flow stress in nanocrystalline Ni nanowires was significantly smaller (d = 5 nm) than that in typical bulk metals (d > 10 nm). The discrepancy was due to the dominance of plasticity via surface slip in Ni nanowires at relatively large grain sizes, which was absent in bulk materials. An interesting grain size- and temperature-dependent "hardening"-to-"softening" transition in Ni nanowires was also revealed in this study. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：9 / 12

页数：4

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