Effect of Ultrasonic Shot Peening on Microstructure and Properties of a 7075 Al-alloy Rod

doi:10.11902/1005.4537.2022.415

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (6): 1293-1302 DOI: 10.11902/1005.4537.2022.415

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Effect of Ultrasonic Shot Peening on Microstructure and Properties of a 7075 Al-alloy Rod

LIU Hao¹, GUO Xiaokai¹, WANG Wei², WU Liankui¹, CAO Fahe¹, SUN Qingqing¹(

)

^1.School of Materials, Sun Yat-sen University, Shenzhen 518107, China
^2.Songshan Lake Materials Laboratory, Dongguan 523808, China

Cite this article:

LIU Hao, GUO Xiaokai, WANG Wei, WU Liankui, CAO Fahe, SUN Qingqing. Effect of Ultrasonic Shot Peening on Microstructure and Properties of a 7075 Al-alloy Rod. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1293-1302.

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Abstract

The effect of ultrasonic shot peening (USSP) on microstructure, microhardness, electrochemical corrosion and intergranular corrosion behavior of a 7075 Al-alloy rod were investigated by means of optical microscopy (OM), X-ray diffraction (XRD), transmission electron microscope (TEM) and corrosion tests.Results showed that after USSP treatment, gradient nanostructures were obtained in the topmost layer with grain size of ~78.2 nm; the precipitated strengthening phases (η and η′ phase) of surface region redissolved into Al matrix, and the hardness of surface layer increased by about 20%. Results of polarization test in 0.1 mol/L Na₂SO₄+20 mmol/L NaCl solution showed that pitting potential of the alloy shifted to the positive directipn position after USSP, implying a better resistance against pitting corrosion initiation. Electrochemical corrosion tests in 3.5%NaCl solution indicated that a higher corrosion rate of 7075 Al-alloy was obtained after USSP treatment. In addition, the corrosion rate showed a decreasing trend as a function of peened sample depth. Intergranular corrosion immersion tests showed that the resistance to intergranular corrosion of AA7075 decreased after USSP treatment. Combined with the microstructure characterization results, the surface strengthening mechanism and corrosion mechanism of ultrasonic shot peened 7075 Al-alloy were discussed.

Key words: 7075 Al-alloy rod surface nanocrystallization microhardness corrosion behaviors

Received: 30 December 2022 32134.14.1005.4537.2022.415

ZTFLH:

TG174

Fund: Open Research Fund of Songshan Lake Materials Laboratory(2021SLABFN13);National Natural Science Foundation of China(52101115)

Corresponding Authors: SUN Qingqing, E-mail: sunqq7@mail.sysu.edu.cn

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	LIU Hao
	GUO Xiaokai
	WANG Wei
	WU Liankui
	CAO Fahe
	SUN Qingqing

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.415 OR https://www.jcscp.org/EN/Y2023/V43/I6/1293

Fig.1 Schematic diagram of ultrasonic shot peening equipment

Fig.2 Cross-sectional metallographic graphs of USSPed 7075 Al-alloy with 40 mm (a, d), 25 mm (b, e) and 15 mm (c, f) impact distances

Fig.3 Average grain size of 7075 Al-alloy rod

Fig.4 XRD patterns of 7075 Al-alloy before and after USSP treatment (0, 50, 100, 200, 300 and 400 μm are the subsequent polishing depths of USSPed samples)

Fig.5 TEM images of the USSPed 7075 Al-alloy at ~5 μm to surface: (a) bright field TEM, (b) corresponding selected area electron diffraction, (c) statistical results of grain size

Fig.6 Hardness-depth profile of 7075 Al-alloy rod after USSP treatment

Fig.7 Open circuit potential-time curves (a) and polarization curves (b) of the untreated and peened 7075 Al-alloy with different impact distances in 0.1 mol/L Na₂SO₄+20 mmol/L NaCl

Table 1 Electrochemical parameters of the untreated and peen-ed 7075 Al-alloy with different impact distances

Fig.8 Open circuit potential-time curves (a) and polarization curves (b) of the untreated and peened 7075 Al-alloy (with surface being polished off 0, 50, 100 μm) in 3.5%NaCl solution

Table 2 Electrochemical parameters of the untreated and peen-ed 7075 Al-alloy (with surface being polished off 0, 50, 100 μm) in 3.5%NaCl solution

Fig.9 Nyquist plot (a) and Bode plots (b, c) and equivalent circuit model (d) of the untreated and peened 7075 Al-alloy (without and with surface being polished off 0, 50, 100 μm)

Table 3 Fitting parameters of EIS shown in Fig.9

Fig.10 Cross-sectional optical micrographs of 7075 Al- alloys after IGC test: (a) 6 h and (b) 2 h immersion of the untreated sample, (c) 6 h and (d) 2 h immersion of the peened sample

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