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Search Results (5)

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Keywords = 7085 high strength aluminum alloys

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19 pages, 13447 KiB  
Article
Study on the Microstructure and Mechanical Properties of 7085 Aluminum Alloy Reinforced by In Situ (ZrB2 + Al2O3) Nanoparticles and Rare Earth Er
by Yuqiang Zhang, Yutao Zhao, Xizhou Kai, Jiadong Yang, Hanfei Zhu and Ying Shan
Materials 2025, 18(9), 2009; https://doi.org/10.3390/ma18092009 - 29 Apr 2025
Viewed by 573
Abstract
This study investigates the synergistic strengthening effects of in situ synthesized nano (ZrB2 + Al2O3) particles and rare earth Er microalloying on the microstructure and mechanical properties of 7085 aluminum alloy. The composite material was prepared through a [...] Read more.
This study investigates the synergistic strengthening effects of in situ synthesized nano (ZrB2 + Al2O3) particles and rare earth Er microalloying on the microstructure and mechanical properties of 7085 aluminum alloy. The composite material was prepared through a melt direct reaction combined with rolling and T6 heat treatment, with microstructural evolution characterized by metallurgical microscopy, XRD, and SEM. Results demonstrate that the addition of 3 vol.% in situ nano (ZrB2 + Al2O3) particles optimally enhances both strength and toughness, achieving a tensile strength of 635.4 MPa (16.2% increase) and elongation after fracture of 16.2% (14.9% improvement) compared to the matrix alloy. Excessive particle content (5 vol.%) leads to severe clustering and deteriorated interfacial bonding, causing performance degradation. Introducing 0.3 wt.% Er improves particle distribution uniformity and promotes Al3(Er,Zr) precipitate formation, refining grains and strengthening interfaces. This further elevates tensile strength to 654.8 MPa (19.7% increase) and elongation to 16.6% (17.7% improvement). The research reveals the synergistic optimization mechanism between particle content and Er addition, providing theoretical support for designing high-performance aluminum matrix composites. Full article
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23 pages, 19764 KiB  
Article
Eliminating Anisotropy of 7085 Alloy Forgings via Temperature Combination Control During Two-Stage Multi-Directional Forging
by Xiao Yin, Wensheng Liu, Xin Tan, Mingdong Wu, Shuo Yuan, Daihong Xiao and Lanping Huang
Materials 2025, 18(2), 391; https://doi.org/10.3390/ma18020391 - 16 Jan 2025
Viewed by 722
Abstract
Due to its high mechanical properties and low quench sensitivity, 7085 aluminum alloy is suitable for the aircraft industry. However, large cross-section forgings of 7085 alloy usually have over 40% anisotropy in mechanical behaviors, especially in the vertical direction. In this study, two-stage [...] Read more.
Due to its high mechanical properties and low quench sensitivity, 7085 aluminum alloy is suitable for the aircraft industry. However, large cross-section forgings of 7085 alloy usually have over 40% anisotropy in mechanical behaviors, especially in the vertical direction. In this study, two-stage multi-directional forgings (MDFs) with different temperature combinations, isothermal medium-temperature composite MDF (MC-MDF) and isothermal hot MDF (H-MDF), were applied to 7085 aluminum alloy ingots. The results indicate that MC-MDF achieved anisotropy below 10% without losing ultimate tensile strength (UTS). Three-dimensional (3D) microstructure analysis suggested that the MC-MDF samples accumulated higher dislocation density and exhibited an enhanced recrystallization structure. The elongation of the vertical direction increased significantly, which lowered the directionality of MC-MDF and increased the effective utilization rate of forgings. Also, MC-MDF obtained a lower yield strength (YS) due to the forging temperature in exchange for higher work hardening and a ductility increase. The average 3D UTS, YS, and EL values of MC-MDF are 554 MPa, 472 MPa, and 13.4%, and the index value reflecting the anisotropy of EL decreased from 14.0% to 8.6% for H-MDF. Full article
(This article belongs to the Section Manufacturing Processes and Systems)
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11 pages, 7386 KiB  
Article
Enhancing Stress Corrosion Cracking Resistance of Low Cu-Containing Al-Zn-Mg-Cu Alloys by Aging Treatment Control
by Ying Li, Mingyang Yu, Xiwu Li, Kai Wen, Lizhen Yan, Kai Zhu and Wei Xiao
Materials 2024, 17(23), 5678; https://doi.org/10.3390/ma17235678 - 21 Nov 2024
Cited by 2 | Viewed by 1076
Abstract
The 7085 aluminum alloy with a low Cu content is an important lightweight structural material in the aerospace field due to its advantages of low density, high specific strength, and high hardenability. However, like other high-strength Al-Zn-Mg-Cu alloys, this alloy is susceptible to [...] Read more.
The 7085 aluminum alloy with a low Cu content is an important lightweight structural material in the aerospace field due to its advantages of low density, high specific strength, and high hardenability. However, like other high-strength Al-Zn-Mg-Cu alloys, this alloy is susceptible to stress corrosion cracking (SCC). Additionally, the lower Cu content may increase its tendency toward SCC, potentially impacting the safe use of this alloy. Therefore, this study investigated the effects of aging treatment processes on the mechanical properties and SCC resistance of 7085 aluminum alloy. And the factors affecting the properties of the alloy were analyzed by optical microscope (OM), scanning transmission electron microscope (STEM), and energy-dispersive X-ray spectroscopy (EDS) analyses. The results indicated that increasing the secondary aging temperature and adding a tertiary aging step can significantly reduce the alloy’s susceptibility to SCC while meeting the mechanical performance requirements. The reduced SCC sensitivity was mainly attributed to the increased spacing of grain boundary precipitates, a wider precipitate-free zone at the grain boundaries, and a higher Cu content in the grain boundary precipitates. Full article
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13 pages, 5505 KiB  
Article
Effects of Deformation at High, Medium, and Cryogenic Temperatures on the Microstructures and Mechanical Properties of Al-Zn-Mg-Cu Alloys
by Wenxue Zhang, Youping Yi, Shiquan Huang, Hailin He and Fei Dong
Materials 2022, 15(19), 6955; https://doi.org/10.3390/ma15196955 - 7 Oct 2022
Cited by 6 | Viewed by 1674
Abstract
Thermomechanical treatment is an effective way to refine the coarse microstructures of aluminum alloys. In this work, multiaxial forging deformation at high, medium, and cryogenic temperatures (i.e., 450, 250, and −180 °C, respectively) was performed on 7085 Al-Zn-Mg-Cu alloys, and its effect on [...] Read more.
Thermomechanical treatment is an effective way to refine the coarse microstructures of aluminum alloys. In this work, multiaxial forging deformation at high, medium, and cryogenic temperatures (i.e., 450, 250, and −180 °C, respectively) was performed on 7085 Al-Zn-Mg-Cu alloys, and its effect on the microstructure evolution and mechanical properties during the subsequent T6 heat treatment process was studied. The results revealed that the coarse particles were broken into finer particles when deformed at cryogenic temperatures, promoting the dissolution of the material after solid solution treatment. Dynamic recrystallization occurred when deformed at 450 °C; however, more dislocations and substructures were found in the samples deformed at 250 and −180 °C, causing static recrystallization after solid solution treatment. The cryogenic deformed sample exhibited a more intense and homogeneous precipitation phase distribution. The strength of the sample deformed at high temperature was high, but its elongation was low, while the strength of the sample deformed at medium temperature was low. The microstructure refinement of the cryogenic deformed sample led to high comprehensive mechanical properties, with an ultimate tensile strength of 535 MPa, a yield strength of 506 MPa, and a fracture elongation of 11.1%. Full article
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8 pages, 3353 KiB  
Article
Environmental Failure Behavior Analysis of 7085 High Strength Aluminum Alloy under High Temperature and High Humidity
by Xiao Yang, Xianfeng Zhang, Yan Liu, Xuefeng Li, Jieming Chen, Xinyao Zhang and Lingqing Gao
Metals 2022, 12(6), 968; https://doi.org/10.3390/met12060968 - 5 Jun 2022
Cited by 6 | Viewed by 2580
Abstract
High-strength aluminum alloys are exposed to more and more environmentally-induced cracking failure behaviors during service. However, due to the hard to detect nature of hydrogen, and the special working conditions, failure research has obvious hysteresis and complexity, and it is impossible to truly [...] Read more.
High-strength aluminum alloys are exposed to more and more environmentally-induced cracking failure behaviors during service. However, due to the hard to detect nature of hydrogen, and the special working conditions, failure research has obvious hysteresis and complexity, and it is impossible to truly reflect the material failure phenomenon and mechanism. In this paper, 7085 high-strength aluminum alloy is selected as the research material to simulate and reproduce the environmental failure phenomenon of aircraft under extreme working conditions (temperature 70 °C, humidity 85%). The results proved that high-strength aluminum alloy has environmental cracking failure behavior under extreme working conditions. The failure mode that was determined was due to environment-induced hydrogen and hydrogen-induced cracking, which is the result of the combined action of hydrogen and stress. Meanwhile, we demonstrate that high-strength aluminum alloy’s environmental failure behavior in an environment of high temperature and high humidity is different from traditional stress corrosion cracking behavior. Full article
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