Effect of Ultrasonic Surface Peening on Fatigue Property of 7B04 High Strength and Toughness Aluminum Alloy

Abstract:

This paper discusses the influence of ultrasonic surface peening on the fatigue property of 7B04 high strength and toughness aluminum alloy. The results showed that a nano-layer of 10-20 μm was formed after ultrasonic surface peening. This nano-layer had a gradient structure with grain size of 10 to 50nm. Further, the ultrasonic surface peening process created residual compressive stress of 200MPa in this nano-layer. This stress caused micro surface cracks to be compressed or closed . Consequently, after ultrasonic surface peening the fatigue life of 7B04 alloy was extended to 5 times.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 1892-1895
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.1892
• Online since: June 2010
• Authors: Qi Fang Zhu, Ze Ming Sun, Tong Da Ma, Vacily A. Klimenov, Viacheslav Borozna, Bao Hong Zhu
• Keywords: Aluminium Alloy, Fatigue Life, Surface Nanocrystallization (SNC), Ultrasonic Surface Peening

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