应力控制模式下疲劳损伤对<strong>AA7075-T651</strong>铝合金腐蚀行为影响的研究

doi:10.11902/1005.4537.2023.271

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 1029-1037 CSTR: 32134.14.1005.4537.2023.271 DOI: 10.11902/1005.4537.2023.271

轻质合金腐蚀与防护专栏

本期目录 | 过刊浏览

应力控制模式下疲劳损伤对AA7075-T651铝合金腐蚀行为影响的研究

翁硕¹^,²^,³(

), 孟超¹, 朱江峰⁴, 王艾¹, 常馨¹, 康妘¹, 何小田¹, 赵礼辉¹^,²^,³

1.上海理工大学机械工程学院上海 200093
2.机械工业汽车机械零部件强度与可靠性评价重点实验室上海 200093
3.上海市新能源汽车可靠性评价公共技术平台上海 200093
4.苏州苏试试验集团有限公司苏州 215129

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

引用本文:

翁硕, 孟超, 朱江峰, 王艾, 常馨, 康妘, 何小田, 赵礼辉. 应力控制模式下疲劳损伤对AA7075-T651铝合金腐蚀行为影响的研究[J]. 中国腐蚀与防护学报, 2024, 44(4): 1029-1037.
Shuo WENG, Chao MENG, Jiangfeng ZHU, Ai WANG, Xin CHANG, Yun KANG, Xiaotian HE, Lihui ZHAO. Effect of Fatigue Damage Under Stress-controlled Mode on the Corrosion Behavior of AA7075-T651 Al-alloy[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 1029-1037.

全文: PDF(6705 KB) HTML

摘要:

通过AA7075-T651铝合金中断疲劳实验、含疲劳损伤试样的拉伸实验、电化学实验及微观结构观察等系统地探究了应力控制模式下疲劳损伤对其力学性能及腐蚀行为的影响。实验结果表明：应力控制模式下的疲劳损伤不仅可以提升AA7075铝合金的综合力学性能，还可以增加其耐腐蚀性，而疲劳损伤前后的微观结构变化(位错密度增加及二次相析出)是影响AA7075铝合金力学性能及腐蚀行为变化的根本原因。

关键词 ：应力控制模式, 疲劳损伤, 腐蚀行为, AA7075-T651铝合金

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

收稿日期: 2023-09-01 32134.14.1005.4537.2023.271

ZTFLH:

TG156

基金资助:国家自然科学基金(52005336)

通讯作者: 翁硕，E-mail：wengshuo@usst.edu.cn，研究方向为结构与材料可靠性评价及设计

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

作者简介: 翁硕，男，1988年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.271 或 https://www.jcscp.org/CN/Y2024/V44/I4/1029

图1 7075-T651铝合金试样尺寸示意图

图2 AA7075-T651铝合金应力比为-0.1下试样的S-N曲线

图3 含不同给定循环周次的疲劳损伤试样的拉伸曲线

图4 含不同给定循环周次的疲劳损伤试样的力学性能变化

图5 含不同给定循环周次的疲劳损伤试样的OCP

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

表1 含不同给定循环周次的疲劳损伤试样在400~1800 s的平均OCP

图6 含不同给定循环周次的疲劳损伤试样的Nyquist和Bode图

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

表2 含不同给定循环周次的疲劳损伤试样拟合电路的相关参数

图7 含不同给定循环周次的疲劳损伤试样的极化曲线图

图8 含不同给定循环周次的疲劳损伤试样的腐蚀电位和腐蚀电流密度图

图9 AA7075-T651铝合金原始试样和疲劳损伤为1/4Nf试样的正面与侧面金相组织

图10 原始试样和预疲劳1/4Nf试样的位错密度形貌

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