Low-cycle fatigue behavior and dislocation structure of an Al-Mg-Sc alloy

被引：18

作者：

Watanabe, C ^{[1
]}

Jin, CY ^{[1
]}

Monzen, R ^{[1
]}

Kitagawa, K ^{[1
]}

机构：

[1] Kanazawa Univ, Dept Mech & Syst Engn, Kanazawa, Ishikawa 9208667, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 387卷

关键词：

Al-Mg-Sc alloy; cyclic deformation; plastic-strain-controlled fatigue test; dislocation structure; precipitation;

D O I：

10.1016/j.msea.2004.05.079

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The low-cycle fatigue behaviour of an Al-Mg-Sc alloy containing coherent Al3Sc particles with average diameters 4 and 11 nm was examined under constant plastic-strain amplitudes in the range of 1.0 x 10(-4) to 5.0 x 10(-3). Although the coherent Al3Sc particles are shearable, no cyclic softening was observed in specimens with large particles of 11 nm. Specimens with small particles of 4 nm showed cyclic softening at plastic-strain amplitudes higher than 1.0 x 10(-3). In the large-particle specimens, dislocations were uniformly distributed under all applied plastic-strain amplitudes, whereas the small-particle specimens, in which the cyclic softening occurred, exhibited clearly developed slip bands. The cyclic softening can be explained by a loss of particle strength through particle redissolution within strongly strained slip bands. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：552 / 555

页数：4

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