Effects of solidification structure on fatigue crack growth in rheocast and thixocast Al-Si-Mg alloys

被引：6
|
作者：
Kim, SW [1 ]
Han, SW [1 ]
Lee, UJ [1 ]
Woo, KD [1 ]
机构：
[1] Chonbuk Natl Univ, RCIT, Div Adv Mat Engn, Jeonju 561756, South Korea
来源：
MATERIALS LETTERS | 2004年 / 58卷 / 1-2期
关键词：
casting; fatigue; eutectic solidification; strain hardening; ductile striation;
D O I：
10.1016/S0167-577X(03)00456-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fatigue crack growth test was performed for rheocast and thixocast Al-Si-Mg aluminum alloys. At small stress intensity factor range (DeltaK), fatigue crack growth (FCG) rate of sample with coarse acicular Si particles decreased slightly compared with specimen with small acicular Si particles. However, at large DeltaK, fatigue crack growth rate of specimen with coarse acicular Si particles drastically increased. This is because large acicular Si particles induce high strain hardening at small DeltaK, but such particles are easily cracked with the increase in DeltaK. Morphology of the Si particles strongly affects striation formation. (C) 2003 Published by Elsevier B.V.
引用
收藏
页码：257 / 261
页数：5
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