Microstructure, fatigue crack growth, and corrosion in friction stir welded Al 5456

被引：0

作者：

Pao, PS ^{[1
]}

Fonda, RW ^{[1
]}

Jones, HN ^{[1
]}

Feng, CR ^{[1
]}

Connolly, BJ ^{[1
]}

Davenport, AJ ^{[1
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

来源：

FRICTION STIR WELDING PROCESSING III | 2005年

关键词：

friction stir welding; mechanical properties; fatigue crack growth; microstructure; corrosion; aluminum; ALUMINUM; EVOLUTION;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure, mechanical properties, fatigue crack growth and corrosion behavior of friction stir welded Al 5456 were investigated. TEM studies reveal substantial decreases in dislocation density in the HAZ and weld nugget, as compared to the base plate, giving rise to a uniformly lower microhardness across those regions. Yield strength also decreases toward the center of the weld. In the nugget region, serrated flow initiates immediately upon yield, while in the base plate such serrated flow does not occur until a significant critical strain is reached. Fatigue crack growth rates in the HAZ are significantly lower and the fatigue crack growth threshold significantly higher than those in the weld nugget and the base plate. Anodic scans across the weld region, using a microelectrochemical cell, indicate the highest anodic reactivity in the nugget region. These results will be discussed in terms of the observed microstructure in various regions of the weld.

引用

页码：27 / 34

页数：8

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