The effect of droplet size on the localized corrosion of high-strength aluminum alloys

Several accelerated tests for high-strength aluminum alloys, such as ASTM G34, ASTM G85 Annex 2, and ASTM G110 can produce significantly different results in third generation aluminum lithium (Al-Li) alloys. In this study, the reason for this inconsistency is investigated by comparing the electrochemical kinetics for AA2060 to those of AA2090 as well as legacy alloy AA7075-T6, and by comparing the performance of AA2060 in ASTM G110 and ASTM G85. The corrosion potential of AA2060 was found to be higher than that of AA7075-T6 and AA2060-T8E41. Also, it was found that although ASTM G110 does not produce exfoliation in AA 2060-T3 as in ASTM G85, the type of attack observed in cross-section is very similar in both tests.

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The Effect of Microstructure on the Properties of High Strength Aluminum Alloys

10.21236/ada133997 ◽

1983 ◽

Author(s):

Edgar A. Starke ◽

Keyword(s):

Aluminum Alloys ◽

High Strength ◽

High Strength Aluminum Alloys ◽

Effect Of Microstructure

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Surface Modification of Aluminum 6061-O Alloy by Plasma Electrolytic Oxidation to Improve Corrosion Resistance Properties

Coatings ◽

10.3390/coatings11010004 ◽

2020 ◽

Vol 11 (1) ◽

pp. 4

Author(s):

Dmitry V. Dzhurinskiy ◽

Stanislav S. Dautov ◽

Petr G. Shornikov ◽

Iskander Sh. Akhatov

Keyword(s):

Corrosion Resistance ◽

Aluminum Alloy ◽

Aluminum Alloys ◽

Plasma Electrolytic Oxidation ◽

Electrochemical Impedance ◽

High Strength ◽

Electrolytic Oxidation ◽

Coating Layers ◽

Plasma Electrolytic ◽

High Strength Aluminum Alloys

In the present investigation, the plasma electrolytic oxidation (PEO) process was employed to form aluminum oxide coating layers to enhance corrosion resistance properties of high-strength aluminum alloys. The formed protective coating layers were examined by means of scanning electron microscopy (SEM) and characterized by several electrochemical techniques, including open circuit potential (OCP), linear potentiodynamic polarization (LP) and electrochemical impedance spectroscopy (EIS). The results were reported in comparison with the bare 6061-O aluminum alloy to determine the corrosion performance of the coated 6061-O alloy. The PEO-treated aluminum alloy showed substantially higher corrosion resistance in comparison with the untreated substrate material. A relationship was found between the coating formation stage, process parameters and the thickness of the oxide-formed layers, which has a measurable influence on enhancing corrosion resistance properties. This study demonstrates promising results of utilizing PEO process to enhance corrosion resistance properties of high-strength aluminum alloys and could be recommended as a method used in industrial applications.

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Accelerated discovery of high-strength aluminum alloys by machine learning

Communications Materials ◽

10.1038/s43246-020-00074-2 ◽

2020 ◽

Vol 1 (1) ◽

Author(s):

Jiaheng Li ◽

Yingbo Zhang ◽

Xinyu Cao ◽

Qi Zeng ◽

Ye Zhuang ◽

...

Keyword(s):

Machine Learning ◽

Aluminum Alloys ◽

Mechanical Performance ◽

High Strength ◽

Cost Effective ◽

Alloy System ◽

Processing Route ◽

Specific Strength ◽

Cu Alloy ◽

High Strength Aluminum Alloys

Abstract Aluminum alloys are attractive for a number of applications due to their high specific strength, and developing new compositions is a major goal in the structural materials community. Here, we investigate the Al-Zn-Mg-Cu alloy system (7xxx series) by machine learning-based composition and process optimization. The discovered optimized alloy is compositionally lean with a high ultimate tensile strength of 952 MPa and 6.3% elongation following a cost-effective processing route. We find that the Al8Cu4Y phase in wrought 7xxx-T6 alloys exists in the form of a nanoscale network structure along sub-grain boundaries besides the common irregular-shaped particles. Our study demonstrates the feasibility of using machine learning to search for 7xxx alloys with good mechanical performance.

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