Effect of Fatigue Damage Under Stress-controlled Mode on the Corrosion Behavior of AA7075-T651 Al-alloy

doi:10.11902/1005.4537.2023.271

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (4): 1029-1037 DOI: 10.11902/1005.4537.2023.271

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Effect of Fatigue Damage Under Stress-controlled Mode on the Corrosion Behavior of AA7075-T651 Al-alloy

WENG Shuo¹^,²^,³(

), MENG Chao¹, ZHU Jiangfeng⁴, WANG Ai¹, CHANG Xin¹, KANG Yun¹, HE Xiaotian¹, ZHAO Lihui¹^,²^,³

1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2. Key Laboratory of Strength and Reliability Evaluation of Auto Mechanical Components for Mechanical Industry, Shanghai 200093, China
3. Shanghai Public Technology Platform for Reliability Evaluation of New Energy Vehicles, Shanghai 200093, China
4. Suzhou Sushi Testing Group Co., Ltd., Suzhou 215129, China

Cite this article:

WENG Shuo, MENG Chao, ZHU Jiangfeng, WANG Ai, CHANG Xin, KANG Yun, HE Xiaotian, ZHAO Lihui. Effect of Fatigue Damage Under Stress-controlled Mode on the Corrosion Behavior of AA7075-T651 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1029-1037.

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Abstract

The effect of fatigue damage under stress-controlled mode on mechanical properties and corrosion behavior of AA7075-T651 Al-alloy was systematically investigated through the interrupted fatigue test, tensile test, electrochemical measurement and microstructure observation. The results show that the acquired fatigue damages can not only improve the comprehensive mechanical properties of AA7075 Al-alloy, but also increase its corrosion resistance. It follows that the change of microstructure (the increase of dislocation density and secondary phase precipitation) before and after being experienced fatigue damages is the fundamental reason that affects the mechanical properties and corrosion behavior of AA7075 Al-alloy.

Key words: stress-controlled mode fatigue damage corrosive behavior AA7075-T651Al-alloy

Received: 01 September 2023 32134.14.1005.4537.2023.271

ZTFLH:

TG156

Fund: National Natural Science Foundation of China(52005336)

Corresponding Authors: WENG Shuo，E-mail：wengshuo@usst.edu.cn

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	WENG Shuo
	MENG Chao
	ZHU Jiangfeng
	WANG Ai
	CHANG Xin
	KANG Yun
	HE Xiaotian
	ZHAO Lihui

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.271 OR https://www.jcscp.org/EN/Y2024/V44/I4/1029

Fig.1 Schematic diagram of sample size of 7075-T651 Al-alloy

Fig.2 S-N curve of AA7075-T651 Al-alloy with stress ratio of -0.1

Fig.3 Tensile curves of fatigue damage samples with different given cycles (a) and local enlarged diagram of Fig.3a (b)

Fig.4 Changes of mechanical properties of fatigue damaged specimens with different given cycles: (a) tensile strength, (b) yield strength, (c) elastic modulus

Fig.5 OCP of fatigue damaged samples with different given cycles: (a) front of the sample, (b) local enlarged of Fig.5a, (c) side of the sample, (d) local enlarged of Fig.5c

Sample	OCP/V
Sample	Front	Side
As-received sample	-0.777	-0.777
Pre-fatigued 1/10 $N f$ sample	-0.772	-0.773
Pre-fatigued 1/4 $N f$ sample	-0.774	-0.771
Pre-fatigued 1/2 $N f$ sample	-0.771	-0.765

Table 1 Average OCP of fatigue damaged samples from 400 s to 1800 s with different given cycles

Fig.6 Nyquist (a, b) and Bode (c, d) plots of fatigue damage samples with different given cycles: (a, c) front of the sample, (b, d) side of the sample

Sample	R_ct / Ω·cm²		R_s / Ω·cm²
Sample	Front	Side	Front	Side
As-received sample	3260	3095	6.96	5.18
Pre-fatigued 1/10 $N f$ sample	3901	3218	7.31	4.68
Pre-fatigued 1/4 $N f$ sample	4602	3685	7.46	4.71
Pre-fatigued 1/2 $N f$ sample	5671	4201	7.26	4.90

Table 2 Relevant parameters of the fitting circuit for fatigue damage samples with different given cycles

Fig.7 Polarization curves of fatigue damage samples with different given cycles: (a) front of the sample, (b) side of the sample

Fig.8 Corrosion potential (a) and corrosion current density (b) diagram of fatigue damaged specimens with different given cycles

Fig.9 Microstructure of the original sample (a, b) and the pre-fatigued 1/4 sample (c, d) of AA7075-T651 aluminum alloy: (a, c) front of the sample, (b, d) side of the sample

Fig.10 Dislocation density morphologies of the original sample (a, b) and pre-fatigued 1/4 $N f$ sample (c, d)

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[1]	WENG Shuo, YU Jun, ZHAO Lihui, FENG Jinzhi, ZHENG Songlin. Effect of Corrosion Damage on Fatigue Behavior of AA7075-T651 Al-alloy[J]. 中国腐蚀与防护学报, 2022, 42(3): 486-492.

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