Tensile behavior of bulk nanocrystalline aluminum synthesized by hot extrusion of ball-milled powders

被引：70
|
作者：
Choi, H. J. [1 ]
Lee, S. W. [1 ]
Park, J. S. [2 ]
Bae, D. H. [1 ]
机构：
[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea
[2] Hanbat Univ, Div Adv Mat Engn, Taejon 305719, South Korea
来源：
SCRIPTA MATERIALIA | 2008年 / 59卷 / 10期
关键词：
Nanocrystalline materials; Aluminium; Compression test; Tension test;
D O I：
10.1016/j.scriptamat.2008.07.030
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The deformation behavior of bulk nanocrystalline aluminum down to 48 nm in grain size, produced by hot extrusion of ball-milled powders, has been evaluated by compression and tension tests. Isotropic yield stress increases following the Hall-Petch relationship with decreasing grain size down to 70 nm. However, a positive deviation in the relationship is found for grain sizes below 70 nm, and aluminum with a grain size of 48 nm exhibits a superior yield stress of 500 MPa with ductile failure. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1123 / 1126
页数：4
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