The effect of grain size diversity on the flow stress of nanocrystalline metals by finite-element modelling

被引：15

作者：

Dobosz, Romuald ^{[1
]}

Lewandowska, Malgorzata ^{[1
]}

Kurzydlowski, Krzysztof J. ^{[1
]}

机构：

[1] Warsaw Univ Technol, Dept Mat Sci & Engn, PL-02507 Warsaw, Poland

来源：

SCRIPTA MATERIALIA | 2012年 / 67卷 / 04期

关键词：

Nanocrystalline materials; Mechanical properties; Finite-element analysis; Grain size diversity; SEVERE PLASTIC-DEFORMATION; NANOSTRUCTURED MATERIALS; MECHANICAL-BEHAVIOR; COPPER; DEPENDENCE; STRENGTH; EXTRUSION; DUCTILITY; CU;

D O I：

10.1016/j.scriptamat.2012.05.043

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The results of finite-element modelling of the effect of grain size uniformity on the flow stress of nanocrystalline metals are reported. The results gave a clear evidence of grain size effect and the reverse Hall-Petch relationship, which is a consequence of macroscopic strain being preferentially accumulated at grain boundaries. They also show the importance of grain size distribution on the flow stress of polycrystals. In fact, K values for the polycrystalline aggregate decrease with increasing grain size diversity. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：408 / 411

页数：4