岳修杰,张平,高业然,孙亚杰,王优强.深冷处理对7075-T6铝合金高速切削亚表层微细观演变及腐蚀机理的影响研究[J].表面技术,2024,53(10):134-143.
YUE Xiujie,ZHANG Ping,GAO Yeran,SUN Yajie,WANG Youqiang.Effect of Cryogenic Treatment on Microstructural Evolution and Corrosion Mechanism in Subsurface Layer of 7075-T6 Aluminum Alloy during High-speed Machining[J].Surface Technology,2024,53(10):134-143
深冷处理对7075-T6铝合金高速切削亚表层微细观演变及腐蚀机理的影响研究
Effect of Cryogenic Treatment on Microstructural Evolution and Corrosion Mechanism in Subsurface Layer of 7075-T6 Aluminum Alloy during High-speed Machining
投稿时间:2023-07-19  修订日期:2023-12-05
DOI:10.16490/j.cnki.issn.1001-3660.2024.10.010
中文关键词:  7075-T6铝合金  深冷处理  微观组织  析出相  表面质量  电化学腐蚀
英文关键词:7075-T6 aluminum alloy  cryogenic treatment  microstructure  precipitated phase  surface quality  electrochemical corrosion
基金项目:国家自然科学基金(51705270);山东省自然科学基金(ZR2022QE149)
作者单位
岳修杰 青岛理工大学 机械与汽车工程学院,山东 青岛 266520 
张平 广东海洋大学 机电工程学院,广东 湛江 524088 
高业然 广东海洋大学 机电工程学院,广东 湛江 524088 
孙亚杰 广东海洋大学 机电工程学院,广东 湛江 524088 
王优强 青岛理工大学 机械与汽车工程学院,山东 青岛 266520 
AuthorInstitution
YUE Xiujie College of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao 266520, China 
ZHANG Ping College of Mechanical and Power Engineering, Guangdong Ocean University, Guangdong Zhanjiang 524088, China 
GAO Yeran College of Mechanical and Power Engineering, Guangdong Ocean University, Guangdong Zhanjiang 524088, China 
SUN Yajie College of Mechanical and Power Engineering, Guangdong Ocean University, Guangdong Zhanjiang 524088, China 
WANG Youqiang College of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao 266520, China 
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中文摘要:
      目的 探究切削速度对经深冷处理和未经深冷处理的7075-T6铝合金微观组织演变机理和耐腐性的影响。方法 选取经深冷处理(T6-C)和未经深冷处理(T6)的7075-T6铝合金进行切削加工,并在3.5%(质量分数)NaCl溶液中进行电化学腐蚀实验。通过透射电镜(TEM)、HRTEM、X射线衍射仪(XRD)、扫描电镜(SEM)和电化学分析,对微观组织演变、表面形貌和耐腐蚀性能进行研究。结果 在相同的切削参数下,相较于T6铝合金,T6-C铝合金表现出更小的晶粒尺寸,铝基体中存在更多的析出相——η相MgZn2,且位错密度以及析出相密度更大,无析出晶界带为断续分布。深冷处理和增大切削速度都显著提高了7075-T6铝合金的耐腐蚀性能,且腐蚀形貌存在显著的龟裂现象。通过电化学分析得知,当切削速度为1 500 m/min时,与未深冷处理相比,深冷处理后的7075-T6铝合金的电流密度减小了3.24×10−6 A/cm2,极化电阻增大了1.68×105 Ω.cm2,在该参数下表现出较好的耐腐蚀性能。与此同时,随着切削速度的增大,容抗弧半径呈增大的变化趋势,且相较于T6铝合金,T6-C铝合金具有更大的容抗弧半径。结论 深冷处理可以有效细化7075-T6铝合金的晶粒结构,进而强化位错密度,从而显著提升该合金的耐腐蚀性能。
英文摘要:
      In the realm of aviation and aerospace, 7075 aluminum alloy has emerged as a pivotal choice for aircraft structural components, engine parts, and aerospace assemblies, owing to its remarkable attributes such as elevated strength and lightweight characteristics. However, confronted with intricate operational conditions, its components are often subject to elevated temperature, high pressure, and frequent load, rendering them susceptible to fractures and failures. Cryogenic treatment can enhance the dislocation density and crystalline structure of 7075 aluminum alloy, thereby bolstering its resistance to stress concentration and corrosion properties. In this paper, 7075-T6 aluminum alloy was selected as the research object, and its microstructure evolution, surface morphology and corrosion resistance were investigated by transmission electron microscopy (TEM), HRTEM, X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical analysis. The present investigation delved into the influence of cutting speed on the microstructural evolution mechanism and corrosion resistance properties of both cryogenically treated and untreated 7075-T6 aluminum alloy.
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