The effect of solution treatment temperature on stress corrosion susceptibility of 7075 aluminium alloy

Shastry, C. R.; Levy, Milton; Joshi, A.

doi:10.1016/0010-938x(81)90016-0

Cited by 28 publications

(5 citation statements)

References 11 publications

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“…Single-stage solid solution, as shown in Figure 9a, refers to enhancing the solid solution effect of the alloy element by simply increasing the final solid solution temperature and extending the solid solution time on the condition of avoiding over-burning. The disadvantage of this method is that the solid solution degree of alloying elements and the recrystallization fraction of the alloy increase simultaneously with the increase of solution temperature and time, and the comprehensive properties after ageing are poor [100]. Some scholars have proposed a stepwise temperature-increasing solution treatment to increase the solid solution degree of alloying elements while effectively suppressing the increase of the recrystallization fraction of the alloy.…”

Section: Solid Solutionmentioning

confidence: 99%

“…It is mainly caused by the continuous decrease of the undissolved second phase and the constantly increase of recrystallization fraction. Shatry et al [100] studied the effect of solution temperature on the stress corrosion properties of Al 7075 alloy. They found that the elements, such as Mg, Zn, Cu, and so on, migrated to the grain boundaries during the solution process.…”

Section: Solid Solutionmentioning

confidence: 99%

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

Zhou

Liu

Zhang

2021

Metals

166

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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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Section: Solid Solutionmentioning

confidence: 99%

Section: Solid Solutionmentioning

confidence: 99%

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

Zhou

Liu

Zhang

2021

Metals

166

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“…그러나 대부분의 고 강도 알루미늄 합금과 같이 Al-Zn-Mg 합금도 부식(corrosion) 및 응력부식균열(stress corrosion cracking)의 저항성이 낮은 결점을 갖고 있다. Al-Zn-Mg 합금의 응력부식의 저항성은 조 직(texture), 소입속도(quenching rate), 시효온도(ageing temperature), 시효시간(ageing time)에 따라 크게 변하는데 [4][5][6][7], 이것은 입내석출물(matrix precipitate), PFZ(precipitate free zone), 입계석출물(grain boundary precipitate)등의 미세조직 (micro structure)에 영향을 주므로 앞선 모든 연구에서도 이들 미세조직의 변화에 주의하여 응력, 부식현상을 설명하고 있다. 금속재료에서 수소는 그것의 기계적 성질에 많은 영향을 미치 는 것으로 잘 알려져 있으며, 최근 많은 연구가 이루어지고 있는 알루미늄 합금에서의 수소관련 연구는 미세구조의 기능에 서 균열성장거동과 인장특성에 대한 내용들이 주를 이루고 있 다 [8,9].…”

Section: 서 론unclassified

A Study on Mechanical Characteristic of Hydrogen Charged Al-6.3Zn-2.4Mg Alloy

Kim¹,

Choi²,

Shim³

et al. 2014

Journal of the Korea Foundry Society

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In this study, the extruded Al-6.3Zn-2.4Mg alloys were selected among the 7000 series aluminum alloys sensitive to hydrogen environment in order to examine the effects of both the aging conditions and the length of hydrogen charging period on the mechanical properties of the alloy. The specimens were aged for 24hours at 100 o C (under aging (UA)), 120 o C (peak aging (PA)), and 160 o C (over aging (OA)), respectively. Charging tests were performed at RT for 12, 24, 36 hours under potentiostatic conditions (−2000 mV vs (Ag/AgCl)) for 12, 24 and 36 hours in 1M H 2 SO 4 and 0.1%NH 4 SCN solution. The fracture surface was examined by scanning electron microscopy (SEM). X-ray diffraction (XRD) pattern in peak aged sample was obtained before and after hydrogen charging from extruded Al-6.3Zn-2.4Mg alloys. The decreasing rate of tensile strength and elongation is represented in order of over aging < under aging < peak aging, and it is believed that the hydrogen recharge is more sensitive to elongation than tensile strength. The formation of AlH 3 in hydrogen charged Al-6.3Zn-2.4Mg alloys has been confirmed by X-ray diffraction studies. 실험 방법

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“…Moreover, the MgZn2 precipitates possess low potential and due to this difference between MgZn2 precipitates and PFZs preferential dissolution occurs [8]. In order to mitigate the corrosion of AA7075 alloys, several researchers have adopted various techniques like solution treatment [9], aging treatment, retrogression, and re-aging (RRA) [10,11]. Some researchers have tried to incorporate ceramic and alloy powders such as nano B4C, TiC, α-β titanium by FSW, and friction stir processing (FSP) techniques to improve corrosion resistance [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Pitting Corrosion in AA7075 Friction Stir Welds on Minor Additions of Silver

Vikas¹,

Narasimha

Bhavani

et al. 2021

J. Eng. Technol. Sci.

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AA7075 is extensively used in aerospace, defense, automotive applications because of its high strength to weight ratio. Issues related to fusion welding and corrosion resistance are key problems associated with these alloys. Friction stir welding is an alternative welding technique that overcomes problems associated with fusion welding. In the present investigation, preliminary studies were done on pitting corrosion behavior of AA7075 friction stir welds by adding silver along the weld joint line. Silver paste was applied along the longitudinal direction of AA7075-T6 rolled plates of 6-mm thickness and cured at 130 °C for 30 seconds. Weld joints were prepared at two different tools rotational speeds, i.e., 750 rpm and 1000 rpm, while keeping other parameters fixed. Welded joints were cut as per the required sizes to study the hardness, microstructure, and pitting corrosion resistance in various regions. It was observed that the hardness was not much affected, but pitting corrosion resistance substantially improved by trace addition of silver. In the stir zone and the thermo-mechanically affected zone, onion ring type marks were observed. Grain refinement in the stirred zone (SZ) was higher at 750 rpm compared to 1000 rpm. The increased hardness in the welds was due to grain refinement. All the observed results were correlated with microstructural features as evidenced by optical microscopy.

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The effect of solution treatment temperature on stress corrosion susceptibility of 7075 aluminium alloy

Cited by 28 publications

References 11 publications

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

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

A Study on Mechanical Characteristic of Hydrogen Charged Al-6.3Zn-2.4Mg Alloy

Pitting Corrosion in AA7075 Friction Stir Welds on Minor Additions of Silver

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