Influence of grain structure on quench sensitivity relative to localized corrosion of high strength aluminum alloy

Liu, Shengdan; Li, Chengbo; Deng, Yunlai; Zhang, Xinming

doi:10.1016/j.matchemphys.2015.10.051

Cited by 33 publications

(11 citation statements)

References 60 publications

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“…The corrosion potential is an electrochemical thermodynamic parameter, which reflects the difficulty of corrosion. The more negative the corrosion potential, the greater the tendency of the alloy to be corroded [15]. The corrosion current density is an electrochemical kinetic parameter, indicating the rate of corrosion.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Heat Straightening Temperature on the Microstructure and Properties of 7N01 Aluminum Alloy

Dong

Shi

et al. 2019

Materials

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The 7N01 aluminum alloys are always used in vehicles, but heat treatment can deteriorate mechanical properties and corrosion resistance, which limits its utilization. In this paper, the influences of the temperature of heat straightening on the corrosion behavior and mechanical properties of 7N01 aluminum alloy are investigated. Most of the initial Guinier Preston (GP) zones dissolve into the matrix during heat treatment process, while the grain boundary precipitates have no obvious change. The precipitates of the samples after heat treatment mainly consist of high density GP zones due to the natural aging effect, which result in the recovery of micro-hardness. Although heat treatment decreases the mechanical properties of 7N01 aluminum alloy, there is no obvious difference in mechanical properties of the specimens after different heat treatment conditions. The corrosion resistance of heat treatment samples decreases significantly compared with the base metal, which is attributed to enhancing the difference between the potential of the alloy matrix and the grain boundary.

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Section: Resultsmentioning

confidence: 99%

The Effects of Heat Straightening Temperature on the Microstructure and Properties of 7N01 Aluminum Alloy

Dong

Shi

et al. 2019

Materials

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“…The grain boundary precipitate η and precipitate-free zones have anodic feature compared with the matrix. The grain boundary precipitates tends to be corroded first, then the precipitates free zones will be attacked [6,19,20,23,57]. Actually, the corrosion susceptibility of Al-Zn-Mg (Cu) alloys is mainly related to the electrochemical potential difference between the matrix and the grain boundary precipitates, precipitate-free zones, respectively [20,23].…”

Section: Discussionmentioning

confidence: 99%

“…Lots of investigations have proposed that the 7000 series alloys often have quenching sensitivity [17,18,19,20,21,22,23,24]. Heterogeneous precipitates can form during quenching cooling and then affect the precipitation process in subsequent artificial ageing [17].…”

Section: Introductionmentioning

confidence: 99%

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Quenching Sensitivity of Al-Zn-Mg Alloy after Non-Isothermal Heat Treatment

Dong

Wang

et al. 2019

Materials

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Type Al-Zn-Mg alloy has a wide ranges of application in vehicles, but corrosion resistance and mechanical properties of this alloy after heat treatment or heat straightening limits its utilization. This paper investigates the effect of quenching condition during non-isothermal heat treatment on corrosion behavior and mechanical properties of Al-Zn-Mg alloy. The corrosion resistance of Al-Zn-Mg alloy decreases after non-isothermal heat treatment and the sample after air quenching has the lowest corrosion resistance, the specimens can get better corrosion resistance when suffered 5 min air cooling followed by water quenching process. The evolution of mechanical properties and corrosion resistance of heat-treated specimens is caused by the modification of distribution of precipitates at grain boundary and the microchemistry of precipitates at grain boundary, precipitate-free zones and the matrix.

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“…After aging, η phase coverage at the grain boundaries of the alloy is high, which results in a high inter-granular corrosion sensitivity [107]. In addition, the large amount of precipitation of the η phase reduces the super-saturation of the alloy, so that the aging precipitation is difficult, and the strength of the alloy is reduced [108]. Therefore, in order to obtain high comprehensive properties of Al 7XXX alloy, the quenching transfer time must be strictly controlled to avoid the alloy temperature falling to the quenching sensitive range, and the alloy temperature must be rapidly reduced below the quenching sensitive range with a fast cooling rate [27,107,[109][110][111][112][113].…”

Section: Quenchingmentioning

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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Influence of grain structure on quench sensitivity relative to localized corrosion of high strength aluminum alloy

Cited by 33 publications

References 60 publications

The Effects of Heat Straightening Temperature on the Microstructure and Properties of 7N01 Aluminum Alloy

The Effects of Heat Straightening Temperature on the Microstructure and Properties of 7N01 Aluminum Alloy

Quenching Sensitivity of Al-Zn-Mg Alloy after Non-Isothermal Heat Treatment

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

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