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Effects of Internal Oxidation Methods on Microstructures and Properties of Al2O3 Dispersion-Strengthened Copper Alloys Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Effect of RRA Treatment on the Microstructure and Fatigue Behavior of 7020 Aluminum Alloy

Authors : Yong Wang, Yunlai Deng, Shengdan Liu, Zhaojun Shan, Jianguo Tang, Xinming Zhang

Published in: High Performance Structural Materials

Publisher: Springer Singapore

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Abstract

The fatigue crack growth (FCG) behavior and fatigue strength of 7020 aluminum alloy in an over aged treatment and two retrogression and re-aging (RRA) treatments were investigated. The microstructures and fractographies were observed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The result showed that RRA-treated alloys have faster FCG rate than over aged alloy at lower ΔK region due to the dense non-shearable precipitates. And the RRA120 alloy re-aged at 120 °C/24 h has a relatively faster FCG rate than RRA150 alloy re-aged at 150 °C/12 h. RRA-treated alloys have higher fatigue strength than over aged alloy. The fatigue strength corresponding to 107 cycles of over aged, RRA120 and RRA150 conditions are 114, 129 and 118 MPa, respectively. The effect of RRA treatment on the fatigue property is mainly caused by its finer and more dispersed precipitates and narrower precipitate free zone (PFZ).

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previous chapter Coarse Grain Layer on Stress Corrosion Cracking Resistance of Al–Zn–Mg Alloy
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Metadata
Title
Effect of RRA Treatment on the Microstructure and Fatigue Behavior of 7020 Aluminum Alloy
Authors
Yong Wang
Yunlai Deng
Shengdan Liu
Zhaojun Shan
Jianguo Tang
Xinming Zhang
Copyright Year
2018
Publisher
Springer Singapore
Book
High Performance Structural Materials

Print ISBN: 978-981-13-0103-2

Electronic ISBN: 978-981-13-0104-9

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-981-13-0104-9_36

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