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Published in: Journal of Materials Engineering and Performance 3/2022

18-10-2021

Fatigue Performance Improvement of 7075-T651 Aluminum Alloy by Ultrasonic Nanocrystal Surface Modification

Authors: Ruixia Zhang, Richard Chiang, Zhencheng Ren, Hao Zhang, Weidong Zhao, Guo-Xiang Wang, Vijay K. Vasudevan, Yalin Dong, Chang Ye

Published in: Journal of Materials Engineering and Performance | Issue 3/2022

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Abstract

In this research, ultrasonic nanocrystal surface modification (UNSM) was used to process a 7075-T651 aluminum alloy. After UNSM treatment, a work-hardened layer with compressive residual stress up to 500 MPa was generated on the near-surface region of the sample. The surface microhardness of the alloy was increased from 195 ± 4 to 225 ± 7 HV, and the surface roughness was decreased from 1.32 ± 0.04 to 0.54 ± 0.27 µm. The stress concentration factor Kt of the as-received specimen was decreased from 1.080 to 1.069 after UNSM processing. Rotating–bending fatigue tests showed that UNSM significantly improved the fatigue performance. In addition, UNSM-treated 7075-T651 samples were able to endure pitting corrosion in a 3.5 wt.% NaCl solution for 72 h without any degradation in fatigue performance. These results demonstrated that UNSM is a robust surface modification method that can improve the rotating–bending fatigue resistance of the aluminum alloy.

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Metadata
Title
Fatigue Performance Improvement of 7075-T651 Aluminum Alloy by Ultrasonic Nanocrystal Surface Modification
Authors
Ruixia Zhang
Richard Chiang
Zhencheng Ren
Hao Zhang
Weidong Zhao
Guo-Xiang Wang
Vijay K. Vasudevan
Yalin Dong
Chang Ye
Publication date
18-10-2021
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 3/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-021-06308-9

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