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Journal of Materials Engineering and Performance

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01-11-2012

Enhanced Fatigue Crack Propagation Resistance in an Al-Zn-Mg-Cu Alloy by Retrogression and Reaging Treatment

Authors: Xu Chen, Zhiyi Liu, Mao Lin, Ailin Ning, Sumin Zeng

Published in: Journal of Materials Engineering and Performance | Issue 11/2012

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Abstract

The microstructures and fatigue crack propagation (FCP) behavior of an Al-Zn-Mg-Cu alloy in T761 and retrogression and reaging (RRA) conditions were characterized by employing differential scanning calorimetry, optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron backscatter diffraction. The results suggested that coarse η′ precipitates were present in T761-treated sample, while fine dispersed η′ precipitates and GP zones were uniformly distributed in RRA-treated ones. Besides, the width of precipitate-free zones (PFZs) in T761-treated sample was found to be much greater than that in RRA-treated ones. Compared with T761-treated sample, the enhanced FCP resistance of RRA-treated sample was attributed to the shearable particles in matrix and narrow PFZs.

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Title: Enhanced Fatigue Crack Propagation Resistance in an Al-Zn-Mg-Cu Alloy by Retrogression and Reaging Treatment
Authors: Xu Chen
Zhiyi Liu
Mao Lin
Ailin Ning
Sumin Zeng
Publication date: 01-11-2012
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 11/2012
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-012-0169-4

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