scholarly journals Effect of Deformation and Aging on Properties of Al-4.1%Cu-1.4%Mg Aluminum Alloy

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Hao Wang ◽  
Changsheng Li ◽  
Jing Li ◽  
Xinglong Wei ◽  
Ruibin Mei
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aging Effect ◽  
Al Alloy ◽  
Exfoliation Corrosion ◽  
Aging Mechanism ◽  
Orthogonal Experiments ◽  
Before And After ◽  
Peak Aging ◽  
Aging Mechanisms

Deformation scheme and preheat treatment of Al-4.1%Cu-1.4%Mg aluminum alloy are chosen, homogenizing annealing at 430°C for 1.5 h, cooling to 250°C in furnace at a cooling rate of less than 30°C/h and then cooling to room temperature to make Al-4.1%Cu-1.4%Mg aluminum alloy annealed fully. Heat treatment tests of Al-4.1%Cu-1.4%Mg aluminum alloy mainly consisting of rolling and aging were conducted, and the optimum peak of aging mechanism is 190°C/12 h. Through comparison of microstructure and mechanical properties with different deformation rates and aging mechanisms, effect of deformation rates and aging mechanism on properties of Al-4.1%Cu-1.4%Mg aluminum alloy was analyzed, and the optimum double peak of aging mechanism is 135°C/7 h + 185°C/14 h. Orthogonal experiments were carried out to analyze mechanical and electrical properties of tested materials before and after deformation, and the effect of aging mechanism on Al-4.1%Cu-1.4%Mg Al alloy was analyzed, and the optimum regression of aging mechanism is 190°C/12 h + 240°C/40 min + 190°C/12 h. Aging scheme is closely related to corrosion resistance of Al-4.1%Cu-1.4%Mg aluminum alloy, and three different aging schemes can improve the corrosion resistance. The exfoliation corrosion evaluation results show that the aging effect on exfoliation corrosion ability order is RRA > two-step aging > peak aging.

Effects of aging mechanisms on the exfoliation corrosion behavior of a spray deposited Al–Zn–Mg–Cu–Zr aluminum alloy

2017 ◽  
Vol 32 (6) ◽  
pp. 1105-1117 ◽  
Author(s):  
Liuqun Xie ◽  
Qian Lei ◽  
Mingpu Wang ◽  
Xiaofei Sheng ◽  
Zhou Li
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Exfoliation Corrosion ◽  
Aging Mechanisms ◽  
Image Position ◽  
Effects Of Aging

Abstract

The Influence of Introduced Strains on the Exfoliation Corrosion Behavior of Mg-14mass%Li-1mass%Al Alloy

2021 ◽  
Vol 1016 ◽  
pp. 587-591
Author(s):  
Hayato Ikoma ◽  
Taiki Morishige ◽  
Toshihide Takenaka
Keyword(s):  
Corrosion Resistance ◽  
Crack Initiation ◽  
Optical Microscopy ◽  
Corrosion Behavior ◽  
Equal Channel Angular Extrusion ◽  
Mg Alloys ◽  
Al Alloy ◽  
Corrosion Morphology ◽  
Exfoliation Corrosion ◽  
Cold Worked

Mg-Li alloys have much better formability than traditional Mg alloys. However, the corrosion resistance of Mg-Li alloys are low due to Li addition and cold-worked Mg-Li alloys sustain exfoliation corrosion, which is serious problem for practical use of Mg-Li alloys [1]. According to our previous report, the elongated grains may be the cause of the exfoliation corrosion. In this study, the exfoliation corrosion behavior of Mg-14mass%Li-1mass%Al (LA141) alloy processed by equal channel angular extrusion (ECAE) is characterized to see the corrosion morphology of the samples introduced more grains than rolling. The specimens processed by rolling showed only elongated grains and the ones processed by ECAE (Route A) at 2 and 4 times showed elongated grains and partially equiaxial grains and in the samples fabricated by ECAE (Route Bc) at 2 and 4 times, equiaxial grains were found by optical microscopy. In corrosion examination, the specimens of rolling and ECAE (Route A) developed exfoliation corrosions and the samples of ECAE (Route Bc) didn’t sustain exfoliation corrosion. This results were consistent with our previous report. Then the corrosion behavior of rolled and ECAEed samples were focused. The evaluation of the time until crack initiation and the number of cracks were employed to see the corrosion morphology of the samples

Influence of Composite Antioxidants to Asphalt Anti-Aging Performance

2012 ◽  
Vol 562-564 ◽  
pp. 380-384
Author(s):  
Bian Hua Li ◽  
Qi Cheng Liu ◽  
Yan Juan Yu ◽  
Du Ming Gong
Keyword(s):  
Softening Point ◽  
Aging Process ◽  
Aging Effect ◽  
Pavement Performance ◽  
Aging Mechanism ◽  
Needle Penetration ◽  
Aging Resistance ◽  
Before And After ◽  
Stable Improvement ◽  
Aging Performance

The durability of the asphalt is of great significance to its pavement performance, so more and more effort has been addressed on improving the asphalt anti-aging performance. In this work, the effects of antioxidant type and formula on the asphalt anti-aging performance were investigated through various measurements before and after aging process including needle penetration, softening point and ductility. Furthermore, the aging mechanism was analyzed via the FTIR (Fourier Transform Infrared) test. As a result, composite antioxidant can observably improve aging resistance of the asphalt. When the formula is 1.2%B+1.5%C+1.2%D, the needle penetration, ductility, softening point are as follows: 39.4×10-1mm, 148.1cm, 52.1°C. FTIR shows that carbonyl absorption peak reduced. Moreover, composite antioxidant can be more stable improvement of asphalt aging effect due to the cooperativity.

Influence of Three-Step Aging Heat Treatment on Properties of 7A04 Aluminum Alloy

2011 ◽  
Vol 704-705 ◽  
pp. 645-649
Author(s):  
Qiu Ze Li ◽  
Lei Xu ◽  
Ji Xiao Song ◽  
Jing Han ◽  
Xing Min Huang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aging Process ◽  
High Strength ◽  
Aging Heat Treatment ◽  
Peak Aging ◽  
Low Temperature Aging ◽  
Mechanical Properties And Corrosion ◽  
Temperature Aging

Aiming at traditional peak aging of 7A04 Aluminum Alloy with high strength but low corrosion resistance, innovative gradually cooling three-step aging heat treatment process were designed, conventional mechanical properties and corrosion resistance of 7A04 aluminum after three kinds of aging treatments was studied through microstructure. The results show that compared with the traditional peak aging process, two gradually cooling three-step aging process is to improve materials tensile strength, plastic and impact toughness in different degrees. Meanwhile corrosion resistance of materials has improved significantly. And extension of low temperature aging time is conducive to the further improvement of strength.

scholarly journals The Effects of Heat Straightening Temperature on the Microstructure and Properties of 7N01 Aluminum Alloy

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2949 ◽  
Author(s):  
Shuai Li ◽  
Honggang Dong ◽  
Lei Shi ◽  
Xingxing Wang ◽  
Zhongying Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Grain Boundary ◽  
Natural Aging ◽  
Aging Effect ◽  
Alloy Matrix ◽  
The Difference ◽  
Heat Straightening

The 7N01 aluminum alloys are always used in vehicles, but heat treatment can deteriorate mechanical properties and corrosion resistance, which limits its utilization. In this paper, the influences of the temperature of heat straightening on the corrosion behavior and mechanical properties of 7N01 aluminum alloy are investigated. Most of the initial Guinier Preston (GP) zones dissolve into the matrix during heat treatment process, while the grain boundary precipitates have no obvious change. The precipitates of the samples after heat treatment mainly consist of high density GP zones due to the natural aging effect, which result in the recovery of micro-hardness. Although heat treatment decreases the mechanical properties of 7N01 aluminum alloy, there is no obvious difference in mechanical properties of the specimens after different heat treatment conditions. The corrosion resistance of heat treatment samples decreases significantly compared with the base metal, which is attributed to enhancing the difference between the potential of the alloy matrix and the grain boundary.

scholarly journals Fabrication of Self-Cleaning Superhydrophobic Surfaces with Improved Corrosion Resistance on 6061 Aluminum Alloys

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 159 ◽  
Author(s):  
Xiaojuan Dong ◽  
Jianbing Meng ◽  
Yizhong Hu ◽  
Xiuting Wei ◽  
Xiaosheng Luan ◽  
...  
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Superhydrophobic Surface ◽  
Al Alloy ◽  
Alloy Sample ◽  
Sliding Angle ◽  
Water Contact ◽  
Self Cleaning

Aluminum alloys are widely used, but they are prone to contamination or damage under harsh working environments. In this paper, a self-cleaning superhydrophobic aluminum alloy surface with good corrosion resistance was successfully fabricated via the combination of sand peening and electrochemical oxidation, and it was subsequently covered with a fluoroalkylsilane (FAS) film. The surface morphology, surface wettability, and corrosion resistance were investigated using a scanning electron microscope (SEM), an optical contact angle measurement, and an electrochemical workstation. The results show that binary rough structures and an FAS film with a low surface energy on the Al alloy surfaces confer good superhydrophobicity with a water contact angle of 167.5 ± 1.1° and a sliding angle of 2.5 ± 0.7°. Meanwhile, the potentiodynamic polarization curve shows that the corrosion potential has a positively shifted trend, and the corrosion current density decreases by three orders of magnitude compared with that of the original aluminum alloy sample. In addition, the chemical stability of the as-prepared superhydrophobic surface was evaluated by dripping test using solutions with different pH values for different immersion time. It indicates that the superhydrophobic surface could provide long-term corrosion protection for aluminum alloys. Consequently, the as-prepared superhydrophobic surface has excellent contamination resistance and self-cleaning efficacy, which are important for practical applications.

scholarly journals EFFECT OF PRECIPITATION HARDENING ON CORROSION BEHAVIOR FOR ALUMINUM ALLOYS 2024 AND 6061 IN 0.5M HCL

2021 ◽  
Vol 25 (Special) ◽  
pp. 2-39-2-48
Author(s):  
Saraa M. Mohammed ◽  
◽  
Sahib M. Mahdi ◽  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Corrosion Behavior ◽  
Room Temperature ◽  
Precipitation Hardening ◽  
Solution Treatment ◽  
Cyclic Polarization ◽  
Before And After ◽  
Aa 2024

The corrosion behavior of both AA 2024 and AA 6061 aluminum alloys in 0.5M HCl before and after solution treatment at room temperature (25 oC) was investigated in this paper to know the effect of the solution heat treatment on the corrᴏsion behavior of both 2024 and 606 aluminum alloys. Using the cyclic polarization test, the corrosion resistance of AA 2024 aircraft aluminum alloy decreases after solution treatment at 495 oC for 2hr from (9.490×10-3 mm/y) to (1.309×10-3 mm/y), while the corrosion resistance of AA6061 aircraft aluminum alloy decreases after solution treatment at 530 oC for 2hr from (886.3× 10-3 mm/y) to (1.270×10-3 mm/y). Pitting corrosion was the prevalent type of corrosion for both alloys.

scholarly journals The Effects of Maintaining Temperature in Annealing Heat Treatment for an FSWed 6061-T6 Al Alloy

2013 ◽  
Vol 19 (S5) ◽  
pp. 69-72
Author(s):  
Seung-Jun Lee ◽  
Min-Su Han ◽  
Seong-Jong Kim
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Welding Process ◽  
Frictional Heat ◽  
Al Alloy ◽  
Friction Stir ◽  
Significant Difference ◽  
Annealing Heat Treatment ◽  
Annealing Heat

AbstractThe technological development of all kinds of lightweight transportation devices including vehicles, aircraft, ships, etc. has progressed markedly with the demand for energy saving and environmental protection. Aluminum alloy is in the spotlight as it is a suitable environmentally friendly material. However, deformation is a major problem during the welding process because aluminum alloy has a large thermal expansion coefficient. In addition, it is known that its corrosion resistance is excellent; nevertheless, in practice, considerable corrosion is generated and this is a major problem. To solve this problem, the friction stir welding (FSW) technology is applied extensively at various industrial fields as a new welding technique. This method involves a process in which materials are joined by frictional heat and physical force. Therefore, we evaluated improvements in mechanical properties and corrosion resistance through annealing heat treatment after FSW. The electrochemical experiment did not show a significant difference. However, the microstructure observation showed defectless, fine crystal particles, indicating excellent properties at 200–225°C.

A universal laser marking approach for treating aluminum alloy surfaces with enhanced anticorrosion, hardness and reduced friction

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 18057-18066 ◽  
Author(s):  
Ming-Kai Tang ◽  
Qiao-Xin Zhang ◽  
Zheng Guo ◽  
Jin-Gui Yu ◽  
Xue-Wu Li ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Large Scale ◽  
Alloy Surface ◽  
Al Alloy ◽  
Laser Marking

Through a simple laser marking approach, microstructures on a large scale AA7075 Al alloy surface have been fabricated. The corrosion resistance, hardness and wear resistance of the surface could be simultaneously improved by this method.

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