Influence of heat treatments on the stress corrosion cracking susceptibility of 7075 aluminum wires in NaCl solutions

Schnatterer, Christian; Zander, Daniela

doi:10.1002/maco.201608978

Cited by 12 publications

(12 citation statements)

References 38 publications

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“…These results indicate that the failure mechanism is intergranular in nature and correlate well with investigations by Schnatterer and Zander, who got the same ranking of susceptibility using the SSRT test. They attributed the higher SCC susceptibility of 7075‐T4 to the substantial IGC influence, due to anodic dissolution of the MgZn 2 precipitates and lower SCC susceptibility of the over‐aged alloy to incorporation of Cu to the grain boundary precipitates, resulting in increase of their potential.…”

Section: Resultssupporting

confidence: 89%

“…Stress corrosion cracking is the synergistic effect of a susceptible material, a corrosive environment and a minimum stress, which results in rapid, catastrophic failure by cracking . It is well known that SCC is highly dependent on metallurgical aspects such as the heat treatment condition, the chemical composition, and the thermomechanical treatments . It is also an environment specific phenomenon that can be influenced by mechanical factors .…”

Section: Introductionmentioning

confidence: 99%

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Comparison of test methods used to analyze stress corrosion cracking of differently tempered 7xxx alloys

Magaji

Mayrhofer

Kröger³

et al. 2019

Materials & Corrosion

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This paper compares and critically analyzes various test methods used to assess stress corrosion cracking susceptibility of the alloy EN AW-7075 (Al-Zn-Mg-Cu) in various temper conditions. Constant load test in an alternating immersion environment was used as the standard reference test. Constant displacement tests in the form of U-bend specimens and four-point loaded bend specimens was conducted in a neutral and acidic salt-spray fog test environment, an alternating saltspray fog environment and alternating immersion environment. A novel incremental step load test was also carried out, in a continuous immersion environment. It was observed that the susceptibility ranking from U-bend test and the standard constant load test correlated well, while the ranking obtained by the 4-point loaded bend test, showed lower correlation. The same susceptibility ranking was observed in all the test environments. It was shown that the neutral salt-spray fog test environments could potentially substitute the alternating immersion test for testing SCC susceptibility.The T4 treated material showed maximum SCC susceptibility followed by T6 treated and the overaged T7 showed least susceptibility. K E Y W O R D S7000 aluminium, Al-Zn-Mg-Cu, automotive corrosion testing, bend test, stress corrosion cracking

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Comparison of test methods used to analyze stress corrosion cracking of differently tempered 7xxx alloys

Magaji

Mayrhofer

Kröger³

et al. 2019

Materials & Corrosion

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show abstract

“…On the other hand, SCC sensitivity may increase when these alloys are tempered especially to the highest strength. SCC is a dangerous type of corrosion and can cause sudden damage even under mechanical loading conditions that are well below the tensile strength of the materials [3]. AA7075 (Al-Zn-Mg-Cu) is used in aircraft, aerospace, automobile, and transportation industries to make durable and lightweight structural components [4][5][6].…”

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confidence: 99%

Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Yarar

Ertürk

Koç

et al. 2022

J. of Materi Eng and Perform

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The main objective of this study is to examine the machinability and the surface quality conditions of the AA7075 material with different temper conditions. For this purpose, various temper treatments are implemented to evaluate the impact of microstructural properties on tool wear and the surface quality of the drilled holes. The drilling operations have been done on 0, F, T4, T6, and T7 temper conditions. Process parameters were three different spindle speeds (715, 1520, and 3030 rev/min) and three feed rates (0.1, 0.2, and 0.3 mm/rev) with HSS-G highperformance ground standard twist drill bit. The present work deals with the effects of temper conditions on thrust force, drilling temperature, tool wear, surface integrity, and chip morphology. Response surface methodology was used in the evaluation of experiment results. The optimization results showed that while thrust force and torque are not significantly affected by a change in spindle speed, they are sensitive to an increase in feed rate. Heat-generation on the drill bit is the lowest at low levels of both the feed rate and spindle speed parameters. The AA7075-T6 condition specimen was machined with continuous chip formation, resulting in the best hole surface quality. The 3D finite element modeling of the drilling process was carried out, and the drilling performance of AA7075-T6 was evaluated in terms of thrust force, heat generation, and chip formation.

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“…Introduction 7075 Al-Zn-Mg-(Cu) aluminium alloy is widely used in industrial applications due to its high strength-to-weight ratio and toughness achieved by precipitation hardening. However, the high susceptibility of 7075 alloy to SCC at peak aged condition limits the application of 7075 alloy in corrosive environments, and continues to remain a great concern [1][2][3][4][5]. Among various corrosion mechanisms, SCC is particularly hazardous.…”

mentioning

confidence: 99%

“…T7 over-aging and retrogression and re-aging (RRA) treatment [7] was developed subsequently to improve the SCC resistance of 7075 alloy. Even so, the decline in mechanical strength after T7 over-aging and the restriction of RRA treatment to thin component still limit the application advantage of 7075 alloy [1].…”

mentioning

confidence: 99%

Investigating the effects of pre-deformation and aging conditions on mechanical properties and SCC resistance of aluminium alloy 7075 via slow strain rate testing and electrochemical polarisation

Hou

Shih

et al. 2022

Corrosion Engineering, Science and Technology

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In this study, the effects of pre-deformation on mechanical properties and stress corrosion cracking behaviour of 7075 alloy was investigated with SSRT and electrochemical polarization. The 10% predeformation substantially improves the SCC resistance of the 7075 alloys. The strain induced dislocations act as diffusion shortcuts and result in enhanced precipitation and early appearance of GBPs in the naturally aged 7075-T3. For artificial aging, pre-deformation causes rapid over-aging as larger precipitates are found in both matrix and GBs of the 7075-T8. The substitution of Cu for Zn in the GBPs and the larger GBPs acting as hydrogen traps are possible explanations for the improved SCC resistance of 7075-T8. Further improvements in SCC resistance can be found in the RRA treated 7075 alloys, while a more ductile behaviour can be seen in the pre-deformed 7075 alloy. Additionally, results of electrochemical testing are in high correlation with the SSRT results.

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Influence of heat treatments on the stress corrosion cracking susceptibility of 7075 aluminum wires in NaCl solutions

Cited by 12 publications

References 38 publications

Comparison of test methods used to analyze stress corrosion cracking of differently tempered 7xxx alloys

Comparison of test methods used to analyze stress corrosion cracking of differently tempered 7xxx alloys

Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Investigating the effects of pre-deformation and aging conditions on mechanical properties and SCC resistance of aluminium alloy 7075 via slow strain rate testing and electrochemical polarisation

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