Effect of retrogression treatments on microstructure, hardness and corrosion behaviors of aluminum alloy 7085

Wang, Yichang; Cao, Lingfei; Wu, Xiaodong; Tong, Xin; Liao, Bin; Huang, Guangjie; Wang, Zhengan

doi:10.1016/j.jallcom.2019.152264

Cited by 88 publications

(29 citation statements)

References 52 publications

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“…However, precipitates are crushed into small particles and distributed along the extrusion direction with a morphology of streamline. [ 31–35 ] Refined grains can also enhance alloys significantly, and those distributed fine particles can pin dislocations tightly, showing a great contribution to improve the strength of alloys.…”

Section: Discussionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

et al. 2020

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Magnesium-lithium alloy is the lightest metal engineering material, which possesses broad applications in the domains of aviation industries and military affairs because of its remarkable advantages, such as perfect electromagnetic shielding, damping properties, and superhigh specific stiffness and strength. Among those significant superiorities, its lower density is the most brilliant feature, which is 1/4-1/3 lighter than that of ordinary magnesium alloys, and almost 1/2 of aluminum alloys. [1-5] In addition, there exists an interest and important structure transformation from hexagonal close-packed (hcp) to bodycentered cubic (bcc) with the increasing Li content in binary Mg-Li alloys, which can reduce the crystal parameter (c/a ratio) of α-Mg and activate more non-basal slip systems. When the mass fraction of Li contents is more than 5.7 wt%, Mg-Li alloy presents a typical duplex-phase structure, which consists of α-Mg (hcp) and β-Li (bcc) phases. Moreover, when Li contents exceed 10.3 wt%, the microstructure of the alloy will be transformed from the duplex phase (α þ β) to single phase (β). [6-12] LA141 (Mg-14Li-1Al) is a kind of superlight alloy (1.333 g cm À3) among the commercial Mg-Li alloys. However, its wide uses are limited by existing problems involving low strength, weak anti-corrosion, and worse age hardening stability. Therefore, it has great significance to improve the performance of the superlight Mg-14Li-based alloy. [13-16] Optimal alloying addition might offer an attractive alternative. Shechtman was the first to discover quasicrystals in magnesium alloys in 1984. The atomic arrangement of quasicrystals is quite different from that of traditional crystals and amorphous alloys, which can significantly improve the comprehensive properties of magnesium alloys. [17-23] In recent years, the idea of quasicrystalline strengthening has been used for reference in the study of Mg-Li alloys. The addition of rare earth elements (RE), such as Y and Gd, to Mg-Li-Zn alloys can produce quasicrystalline strengthening phases with hightemperature stability and other kinds of mesophase strengthening matrices. In addition, Y and Gd have relatively higher solid solubility in the α-Mg matrix. [24] However, there are few reports about the strengthening effect of Zn/Y and Zn/Gd addition on Mg-Li alloy with single β-Li phase. Accordingly, elements Zn, Y, and Gd were added to the chosen Mg-14Li-based alloy. Therefore, Mg-14Li-2Zn-1Y (named LZY1421), Mg-14Li-3Zn-1Y (named LZY1431), Mg-14Li-6Zn-2Y (named LZY1462) and Mg-14Li-2Zn-1Gd (named LZG1421), Mg-14Li-3Zn-1Gd (named LZG1431), Mg-14Li-6Zn-2Gd (named LZG1462) alloys were prepared as

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Section: Discussionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

et al. 2020

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“…In the stage of high-temperature retrogression, the finer GP zones and η' phase are re-dissolved, while the grain boundary precipitates have almost no re-dissolution due to the large size and that has been transformed into stable η phase [37,131]. During the re-aging process, the fine and dispersed GP zones and η' phase are re-precipitated in the alloy grains, and the grain boundary precipitates can nucleate and grow based on the existing precipitates, which eventually become discontinuously distributed [36,[135][136][137], as shown in Figure 18. Yang et al [120] studied the mechanical and corrosion resistance properties of Al-6.0Zn-2.3Mg-1.8Cu-0.1Zr (wt %) alloy on different aging treatment conditions.…”

Section: Retrogression and Re-agingmentioning

confidence: 99%

The Advancement of 7XXX Series Aluminum Alloys for Aircraft Structures: A Review

Zhou

Liu

Zhang

2021

Metals

163

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7XXX series aluminum alloys (Al 7XXX alloys) are widely used in bearing components, such as aircraft frame, spars and stringers, for their high specific strength, high specific stiffness, high toughness, excellent processing, and welding performance. Therefore, Al 7XXX alloys are the most important structural materials in aviation. In this present review, the development tendency and the main applications of Al 7XXX alloys for aircraft structures are introduced, and the existing problems are simply discussed. Also, the heat treatment processes for improving the properties are compared and analyzed. It is the most important measures that optimizing alloy composition and improving heat treatment process are to enhance the comprehensive properties of Al 7XXX alloys. Among the method, solid solution, quenching, and aging of Al 7XXX alloys are the most significant. We introduce the effects of the three methods on the properties, and forecast the development direction of the properties, compositions, and heat treatments and the solution to the corrosion prediction problem for the next generation of Al 7XXX alloys for aircraft structures. The next generation of Al 7XXX alloys should be higher strength, higher toughness, higher damage tolerance, higher hardenability, and better corrosion resistance. It is urgent requirements to develop or invent new heat treatment regime. We should construct a novel corrosion prediction model for Al 7XXX alloys via confirming the surface corrosion environments and selecting the accurate and reliable electrochemical measurements.

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“…T7452 heat treatment has been proved to be an effective method to simultaneously improve the fracture toughness and corrosion resistance of 7085 Al alloy [10,11]. Thus, there have been many investigations on the microstructures and properties of 7085-T7452 Al alloy [5,10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Study on the Relationship between High Temperature Mechanical Properties and Precipitates Evolution of 7085 Al Alloy after Long Time Thermal Exposures

Zang

Dai

Yang

et al. 2021

Metals

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The requirement for 7085 Al alloy as large airframe parts has been increasing due to its low quenching sensitivity and high strength. However, the relationship between high temperature mechanical properties and the evolution of precipitates in hot environments is still unclear. In this work, thermal exposure followed by tensile tests were conducted on the 7085 Al alloy at various temperatures (100 °C, 125 °C, 150 °C and 175 °C). Variations of hardness, electrical conductivity and tensile properties were investigated. The evolution of the nano scale precipitates was also quantitatively characterized by transmission electron microscopy (TEM). The results show that the hardness and electrical conductivity of the alloy are more sensitive to the temperature than to the time. The strength decreases continuously with the increase of temperature due to the transformation from η′ to η phase during the process. Furthermore, the main η phase in the alloy transformed from V3 and V4 to V1 and V2 variants when the temperature was 125 °C. Additionally, with increasing the temperature, the average precipitate radius increased, meanwhile the volume fraction and number density of the precipitates decreased. The strengthening effect of nano scale precipitates on tensile properties of the alloy was calculated and analyzed.

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Effect of retrogression treatments on microstructure, hardness and corrosion behaviors of aluminum alloy 7085

Cited by 88 publications

References 52 publications

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

The Advancement of 7XXX Series Aluminum Alloys for Aircraft Structures: A Review

Study on the Relationship between High Temperature Mechanical Properties and Precipitates Evolution of 7085 Al Alloy after Long Time Thermal Exposures

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