Formation process of shear bands and protrusions in ultrafine grained copper under cyclic stresses

被引：52

作者：

Goto, M ^{[1
]}

Han, SZ

Yakushiji, T

Lim, CY

Kim, SS

机构：

[1] Oita Univ, Dept Engn Mech, Oita 8701192, Japan

[2] Korea Inst Machinery & Mat, Dept Mat Engn, Chang Won 641010, Kyungnam, South Korea

[3] Oita Natl Coll Technol, Dept Engn Mech, Maki, Oita 8700152, Japan

[4] Gyeongsang Natl Univ, Dept Mat Sci & Engn, Chinju 660701, South Korea

来源：

SCRIPTA MATERIALIA | 2006年 / 54卷 / 12期

关键词：

fatigue; shear bands; ultrafine grained microstructure; equal channel angular pressing; copper;

D O I：

10.1016/j.scriptamat.2006.03.001

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ultrafine grained copper processed by equal channel angular pressing was fatigued at two constant stress amplitudes: (sigma(a) = 240 and 120MPa (corresponding fatigue lives were Nf divided by 2 x 10(5), and 4 x 10(6) cycles, respectively). Significant differences in the morphological features of post-fatigued surfaces between the high and low cyclic stress amplitudes were observed. To clarify the formation process of the surface damage, the morphological changes in the surface damage caused by the cyclic stresses were monitored successively by an optical microscope. Putting the optical microscopy and scanning electron microscopy observations of the post-fatigued surfaces together, the formation process of surface damage was discussed. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2101 / 2106

页数：6

共 22 条

[1] Cyclic softening of ultrafine grain copper [J].