Modelling grain boundary strengthening in ultra-fine grained aluminum alloys

被引：48
|
作者：
Nes, E [1 ]
Holmedal, B
Evangelista, E
Marthinsen, K
机构：
[1] Norwegian Univ Sci & Technol, Dept Mat Technol, N-7491 Trondheim, Norway
[2] Univ Ancona, Dept Mech, I-60131 Ancona, Italy
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 410卷
关键词：
aluminum alloys; modelling work hardening; grain boundary strengthening; ultra-fine grained materials; Luders band;
D O I：
10.1016/j.msea.2005.08.121
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The mechanical properties of aluminum alloys with grain sizes in the range from less than a micron (ultra-fine) to hundreds of microns have been modelled within the framework of the multi-parameter microstructural work hardening model developed by Nes and co-workers [E. Nes, Prog. Mater. Sci. 41 (1998) 129-194; K. Marthinsen, E. Nes, Mater. Sci. Technol. 17 (2001) 376-388; E. Nes, K, Marthinsen, Mater. Sci. Eng. A322 (2002) 176-193; E. Nes, K. Marthinsen, B. Holmedal, Mater. Sci. Technol. B 20 (2004) 1377-1382]. The effect of grain size on the flow stress and work hardening, including a deviation front the Hall-Petch grain size dependency for ultra-fine grain sizes, is well accounted for by the model. A characteristic feature of the stress-strain behaviour of Al-Mg-alloys and ultra-fine grained variants is a sharp yield point followed by Luders-band elongation. A mechanism for such an elastic-plastic transition is Suggested. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：178 / 182
页数：5
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