Influence of Different Surface Treatments on Fatigue Life of 7050 Al Alloy

Abstract:

The fatigue life of 7050 Al alloy samples after different surface treatments, i.e., as-machined, anodizing, shot peening, and shot peening followed by anodizing, had been tested. The shot peening treatment specimens presented the longest average fatigue life. The fatigue life of anodizing treatment specimens decreased by 69.3% and 78.8% at 215 MPa and 260 MPa stress levels than as-machined ones. Introducing the shot peening treatment before anodizing can increase the fatigue life by 220% / 296.9% at 215 MPa/260 Mpa than that only treated by anodizing. The effect of the surface treatments on the fatigue life were studied by performing surface morphology investigation, residual stress measurements and fracture surface analysis.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 142-148
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.142
• Online since: January 2019
• Authors: Nan Li*, Hai Tao Li, Jing Yi Zhou, Hong Tao Liu, Chang Kui Liu, Shi Yu Qu
• Keywords: Al Alloy, Anodizing, Fatigue Life, Residual Stress, Shot Peening

References

[1] Yang Shoujie, Dai Shenlong. A glimpse at the development and application of aluminum alloys in aviation industry [J]. Materials Review, 2005, 19 (2): 76-80.

[2] Wen Peigang, Li Guoai, Lu Zheng. Effect of aging treatment on fracture behavior of Al-Li alloy [J]. Failure Analysis and Prevention. 2016, 11(3): 139-142.

[3] Zhou Song, Xie Liyang, Hui Li. Influence of Shot Peening on Fatigue Life of 2XXX Aluminum Alloy [J]. Journal of Materials Engineering. 2014, 12: 86-91.

[4] M. Shahzad et al. Surface characterization and influence of anodizing process on fatigue life of Al 7050 alloy [J]. Materials and Design. 2011, 32: 3328–3335.

DOI: 10.1016/j.matdes.2011.02.027

[5] D.T. Asquith, A.L. Yerokhin, J.R. Yates. Effect of combined shot-peening and PEO treatment on fatigue life of 2024 Al alloy [J]. Thin Solid Films. 2006, 515: 1187–1191.

DOI: 10.1016/j.tsf.2006.07.123

[6] Cai Jianping, Li Bin, Liu Minghui. Effect of anodizing on fatigue performance of aeronautic aluminum alloys [J]. Journal of Aeronautical Materials. 2007, 27 (2): 25-28.

[7] G.H. Majzoobi , F. Abbasi .On the effect of shot-peening on fretting fatigue of Al7075-T6 under cyclic normal contact loading [J]. Surface & Coatings Technology. 2017, 328: 292–303.

DOI: 10.1016/j.surfcoat.2017.08.067

[8] Zhang P., Lindemann J., Leyens C. Shot peening on the high-strength wrought magnesium alloy AZ80-effect of peening media [J]. J. Mater. Process. Technol. 2010, 210: 445–450.

DOI: 10.1016/j.jmatprotec.2009.10.005

[9] Huang zhichao, Lu Shiliang, Xie Chunhui. Development on surface modification technology of advanced shot peening [J]. Materials Science & Technology. 2015, 23 (3): 57-61.

[10] Zhang Xinming, Han Nianmei, Liu Shengdan. Inhomogeneity of texture, tensile property and fracture toughness of 7050 aluminum alloy thick plate [J]. The Chinese Journal of Nonferrous Metals. 2010, 20 (2): 202-208.

[11] Zhao Feng, Lu Fayun, Guo Fuan. Comparative analysis of microstructure and properties of two kinds of thick plates of 7050-T7451 aluminum alloy [J]. Journal of Aeroonautical Materials. 2015. 35(2): 64-71.

[12] Chen Yueliang, Wang Andong, Bian Guixue. Study on electrochemical behavior of 2024-T3 aluminum alloy in different acidic aqueous solution [J]. Failure Analysis and Prevention. 2017, 12(2): 78-86.

[13] Li feng, Yu Bingao, Liu Weiwei. Experiment of Residual Stress in Milling High-Temperature Stainless Steel [J]. Tool Engineering. 2016, 50 (11): 48-50.

[14] Hou Xueqin, He Yuhuai, Jiang Tao. Study on fracture morphologies of Nickel based P/M superalloy [J]. Materials Science Forum. 2014, 788: 531-537.

DOI: 10.4028/www.scientific.net/msf.788.531