Interaction of strain rate and hydrogen input on the embrittlement of 7075 T6 Aluminum alloy

Dey, Swapna; Chattoraj, I

doi:10.1016/j.msea.2016.03.010

Cited by 27 publications

(12 citation statements)

References 34 publications

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“…The fracture surface of the SC7 sample also consists of three regions (Figure c), but regions I and II are shallower and deeper, respectively, than their C7 counterparts. A magnified view of the fracture surface (Figure d) reveals that region II is characterized by typical brittle fracture induced by HE . The morphology of this region is distinct from that of the ductile zone shown in Figure b.…”

Section: Resultsmentioning

confidence: 89%

Effects of pre‐corrosion on mechanical properties of 7B50‐T7751 aluminum alloy in sodium chloride solution

Liu

Zhang

et al. 2017

Materials & Corrosion

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The effects of pre‐corrosion, including corrosion and stress corrosion, on the mechanical properties of 7B50‐T7751 aluminum alloy in sodium chloride solution were investigated. The results revealed that coarse and discontinuously distributed grain boundary precipitates (η‐MgZn2) in the alloy resulted in decreased susceptibility to intergranular corrosion (IGC) and hydrogen embrittlement (HE). However, the mechanical properties (especially the elongation of the alloy) were significantly degraded, owing to the synergistic effect of anodic dissolution and hydrogenation associated with pre‐corrosion. This degradation was exacerbated by the tensile stress. With increased exposure time, the dominant mechanism for elongation degradation transformed from anodic dissolution to HE, and the effect of the tensile stress on the degradation decreased gradually. Moreover, the Weibull function model can be used to accurately and quantitatively describe the maximum pit depth evolution of the alloy.

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Section: Resultsmentioning

confidence: 89%

Effects of pre‐corrosion on mechanical properties of 7B50‐T7751 aluminum alloy in sodium chloride solution

Liu

Zhang

et al. 2017

Materials & Corrosion

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“…At the present time, no experimental data could be given to assess this hypothesis. However, as mentioned previously, data from the literature showed that the structure of hydrated oxide films was affected by relative humidity aod by alloy composition [35,56,57]. Moreover, it was reported that the ordering of adsorbed water changed with relative humidity [ 48,58,59], and it could be assumed that the composition of the hydrated oxide would have some influence on this phenomenon.…”

Section: About the Anal Ys Is Of The Results From Tensile Tests Pejomentioning

confidence: 82%

“…showing that laboratory air was definitively not an inert atmosphere. The influence of the testing environment on !ensile tests results was also studied more recently by Dey et al [35].…”

Section: Furthermore Work Performed By Holroyd Et Al [33] and Muelmentioning

confidence: 92%

“…Reference tests corre sponded to tensile tests in the same environment as previously (i.e., laboratory air under controlled moisture) without hydrogen precharging. However, considering the results obtained by different authors [33][34][35][36] relative to SSRT tests performed in laboratory air, the influence of this specific environment during !ensile tests, in particular those at low strain rate, was also investigated to help in the interpre tation of the results obtained for the hydrogen-precharged samples. heat treated and then stored at room temperature for two weeks until microstructure stabilisation.…”

Section: Furthermore Work Performed By Holroyd Et Al [33] and Muelmentioning

confidence: 99%

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Hydrogen - dislocation interactions in a low-copper 7xxx aluminium alloy: About the analysis of interrupted stress corrosion cracking tests

Oger

Andrieu

Odemer

et al. 2020

Materials Science and Engineering: A

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Aluminium alloys are susceptible to stress corrosion cracking (SCC) in specific conditions, which can be asso ciated with hydrogen embrittlement (HE). Interrupted SCC tests are often performed to evaluate the suscepti bility of the samples to a specific environment under mechanical loading. Those tests consist in a pre-corrosion step, which can lead to hydrogen-precharging, followed by a tensile test in air. The present study, perfonned on a 7046 aluminium alloy, confinned literature data showing that tensile tests in laboratory air on as-polished samples at sufficiently low strain rates led to a significant hydrogen ingress. Depending on the sample micro structure, varions hydrogen-dislocations and dislocations-microstructure interactions could be effective leading to a change in the tensile behaviour of the samples. Such a phenomenon cotùd lead to misinterpret the interrupted sec tests perfonned on hydrogen-precharged sarnples. In the present study, a corrected sec sus ceptibility factor was defined to better analyse the interrupted SCC tests.

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“…With the aging treatment at 413 K for 6 h, 16 h, 98 h, 200 h, the fracture surface pattern of the sample tested in 3.5% NaCl solution is shown in Figure 6. Dey et al [45] proposed some improvement schemes to limit the diffusion depth of H in the material. Many scholars have proposed that coating is also based on the depth of H diffusion in the material.…”

Section: The Depth Of Hydrogen Penetrationmentioning

confidence: 99%

Analysis of Hydrogen Embrittlement on Aluminum Alloys for Vehicle-Mounted Hydrogen Storage Tanks: A Review

Chen

Zhao

et al. 2021

Metals

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High-pressure hydrogen tanks which are composed of an aluminum alloy liner and a carbon fiber wound layer are currently the most popular means to store hydrogen on vehicles. Nevertheless, the aluminum alloy is easily affected by high-pressure hydrogen, which leads to the appearance of hydrogen embrittlement (HE). Serious HE of hydrogen tank represents a huge dangers to the safety of vehicles and passengers. It is critical and timely to outline the mainstream approach and point out potential avenues for further investigation of HE. An analysis, including the mechanism (including hydrogen-enhanced local plasticity model, hydrogen-enhanced decohesion mechanism and hydrogen pressure theory), the detection (including slow strain rate test, linearly increasing stress test and so on) and methods for the prevention of HE on aluminum alloys of hydrogen vehicles (such as coating) are systematically presented in this work. Moreover, the entire experimental detection procedures for HE are expounded. Ultimately, the prevention measures are discussed in detail. It is believed that further prevention measures will rely on the integration of multiple prevention methods. Successfully solving this problem is of great significance to reduce the risk of failure of hydrogen storage tanks and improve the reliability of aluminum alloys for engineering applications in various industries including automotive and aerospace.

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Interaction of strain rate and hydrogen input on the embrittlement of 7075 T6 Aluminum alloy

Cited by 27 publications

References 34 publications

Effects of pre‐corrosion on mechanical properties of 7B50‐T7751 aluminum alloy in sodium chloride solution

Effects of pre‐corrosion on mechanical properties of 7B50‐T7751 aluminum alloy in sodium chloride solution

Hydrogen - dislocation interactions in a low-copper 7xxx aluminium alloy: About the analysis of interrupted stress corrosion cracking tests

Analysis of Hydrogen Embrittlement on Aluminum Alloys for Vehicle-Mounted Hydrogen Storage Tanks: A Review

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