Journal ArticleDOI
Influence of repetitious-RRA treatment on the strength and SCC resistance of Al―Zn―Mg―Cu alloy
TLDR
In this article, the effect of repetitious-retrogression and reaging (repetitious-RRA) treatment on the strength and SCC resistance of Al-Zn-Mg-Cu alloy was investigated by the slow strain rate technique (SSRT) and electrical conductivity test, using TEM, EDS and SEM.Abstract:
Influence of repetitious-retrogression and reaging (repetitious-RRA) treatment on the strength and SCC resistance of Al–Zn–Mg–Cu alloy was investigated by the slow strain rate technique (SSRT) and electrical conductivity test, using TEM, EDS and SEM. Additionally, the strength of alloy was characterized by Vickers hardness. The results show that within 3 times RRA treatments, SCC resistance increases with the increase of time, while maintaining strength as compared to RRA treatment, TEM observation along with EDS analysis indicates that within 3 times, matrix precipitates (MPs) in repetitious-RRA treatment are similar to those by RRA treatment and grain boundary precipitates (GBPs) become more discrete and coarser with the time. However, RRA treatment reaches 4 times, the SCC resistance gets worse because MPs are also coarse. Besides, the Cu content of GBPs increases with the time, inversely for Zn content, which is another reason for improving the SCC resistance.read more
Citations
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Recent advances in the development of aerospace materials
Xuesong Zhang,Yongjun Chen,J. Hu +2 more
TL;DR: In this paper, the authors focus on the following topics: (1) materials requirements in design of aircraft structures and engines, (2) recent advances in the development of aerospace materials, (3) challenges faced by recent aerospace materials and (4) future trends in aerospace materials.
Journal ArticleDOI
Effect of heat treatment on strength, exfoliation corrosion and electrochemical behavior of 7085 aluminum alloy
TL;DR: In this article, the influence of heat treatment on strength, exfoliation corrosion and electrochemical behavior of 7085 aluminum alloy has been investigated by tensile testing and EIS combined with transmission electron microscope (TEM).
Journal ArticleDOI
The effect of quench rate and overageing temper on the corrosion behaviour of AA7050
TL;DR: In this article, the corrosion behavior of AA7050 on different quench rates and ageing conditions has been studied using immersion tests and complementary techniques like SEM, TEM-EDS and Scanning Kelvin probe force microscopy.
Journal ArticleDOI
Aging behavior and precipitate characterization of a high Zn-containing Al-Zn-Mg-Cu alloy with various tempers
TL;DR: In this article, the influence of one-step and two-step aging treatments on hardness, electrical conductivity and mechanical properties of a high Zn-containing Al-Zn-Mg-Cu alloy is investigated and detailed aging parameters subjected to various aging tempers, i.e., T6, T79, T76, T74 and T73, are proposed.
Journal ArticleDOI
Effect of retrogression and reaging treatment on the microstructure and fatigue crack growth behavior of 7050 aluminum alloy thick plate
TL;DR: In this paper, the effect of retrogression and reaging (RRA) treatment on the microstructure and fatigue crack growth behavior of a 7050 aluminum alloy thick plate was investigated by means of scanning electron microscopy (SEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD).
References
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Journal ArticleDOI
Stress corrosion cracking of aluminum alloys
TL;DR: In this article, the results of stress corrosion tests with aluminum alloys that have been obtained to date with fracture mechanics techniques are reviewed. But the present and limited status of theoretical understanding of the stress corrosion cracking is outlined.
Journal ArticleDOI
Evolution of precipitate microstructures during the retrogression and re-ageing heat treatment of an Al–Zn–Mg–Cu alloy
TL;DR: Using a combination of experimental techniques, including anomalous small-angle scattering and atom-probe tomography, the evolution of precipitate microstructures during the different steps of retrogression and re-ageing (RRA) heat treatments of an Al-Zn-Mg-Cu alloy has been systematically evaluated as discussed by the authors.
Journal ArticleDOI
Correlations between intergranular stress corrosion cracking, grain-boundary microchemistry, and grain-boundary electrochemistry for Al-Zn-Mg-Cu alloys
TL;DR: In this paper, a correlation between the initial open-circuit potential of fresh brittle intergranular fracture surfaces, the copper content of grain-boundary precipitates (GBP), and the plateau SCC velocities of overaged 7079 and 7075 alloys was found.
Journal ArticleDOI
Recently-Developed Aluminium Solutions for Aerospace Applications
TL;DR: In this paper, two principal approaches are available to materials' engineers to improve the overall cost-weight balance of metallic airframe structures: improving alloy performance and optimising materials' utilisation.
Journal ArticleDOI
Effect of Retrogression and Reaging Treatments on the Microstructure of AI-7075-T651
Joong Keun Park,Aj Ardell +1 more
TL;DR: The effect of retrogression and reaging on the microstructure of Al-7075 in the T651 temper, both in the matrix and on grain boundaries, was studied using transmission electron microscopy as discussed by the authors.