Effect of water vapor pressure on fatigue crack growth in Al–Zn–Cu–Mg over wide-range stress intensity factor loading

Burns, James T.; Bush, Ralph; Ai, Jiahe; Jones, Jennifer; Lee, Yong-Won; Gangloff, Richard P.

doi:10.1016/j.engfracmech.2014.11.009

Cited by 30 publications

(14 citation statements)

References 74 publications

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“…One of the characteristics of heat treatment of aluminum [21] is rapid formation of a thin layer of passive oxide of Al2O3 [22][23][24]. The hydrogen bubbles formed in the aluminum microstructure during heat treatment depend on many aspects, such as water vapor pressure [25], solubility [26,27], permeability, diffusivity [28] and activity [28,29]. Some of these aspects can be verified by mass spectrometric analyzer [11] or a thermal desorption spectroscopy system [30].…”

Section: Hydrogen In High Temperature Solid Aluminum Alloysmentioning

confidence: 99%

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Diehl¹,

Schneider²,

Clarke³

2021

Tecnol. Metal. Mater. Min.

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The solution treatment of aluminum alloys can be restricted by the presence of porosity defects caused by the moisture present in the process or by the hydrated front on the material surface. Hydrogen blisters cause deleterious effects on mechanical properties and surface finish. However, the formation of bubbles in solid aluminum is not caused only by the known reaction 2Al+3H 2 O=3H 2 +Al 2 O 3 , as it does not explain the interaction of the aluminum oxide layer with the formation mechanisms. In addition, the literature approaches show that there is more than one mechanism for the formation of these defects, but no work has made an association between them. Thus, the objective of this work is to carry out extensive research on the state of the art of hydrogen blister formation in aluminum alloys during the solubilization heat treatment. Contemplating different proposed mechanisms of bubble formation on the surface and structure, the analysis of this association of approaches indicated that the mechanisms depend on both permeability, where the hydrated oxide front creates passage for the formation of blister in the sublayer, as well as diffusion and hydrogen solubility in the microstructure.

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Section: Hydrogen In High Temperature Solid Aluminum Alloysmentioning

confidence: 99%

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Diehl¹,

Schneider²,

Clarke³

2021

Tecnol. Metal. Mater. Min.

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“…There is an extensive data based on fatigue crack growth rates (FCGRs; d a /d N ) versus stress intensity range relationships for alloys used in airframe structures; such data are typically generated in ambient laboratory conditions. However, aluminum alloys (and other structural alloys) 10–12 have drastically slower FCGR behavior at low temperature and low water vapor pressure environments 13–23 . Such environments are pertinent to high‐altitude operation, where a significant portion of loading can occur for airframe structural components 13,17 .…”

Section: Introductionmentioning

confidence: 99%

“…Such environments are pertinent to high‐altitude operation, where a significant portion of loading can occur for airframe structural components 13,17 . The phenomenological and mechanistic underpinnings of the low moisture environment effect on aerospace aluminum alloys fatigue cracking behavior have been extensively studied 13,14,18,21,24–39 . It is understood that in moist air, the environmental cracking contribution is governed by hydrogen environment embrittlement 20,27,40–42 .…”

Section: Introductionmentioning

confidence: 99%

“…However, aluminum alloys (and other structural alloys) [10][11][12] have drastically slower FCGR behavior at low temperature and low water vapor pressure environments. [13][14][15][16][17][18][19][20][21][22][23] Such environments are pertinent to high-altitude operation, where a significant portion of loading can occur for airframe structural components. 13,17 The phenomenological and mechanistic underpinnings of the low moisture environment effect on aerospace aluminum alloys fatigue cracking behavior have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

“…13,17 The phenomenological and mechanistic underpinnings of the low moisture environment effect on aerospace aluminum alloys fatigue cracking behavior have been extensively studied. 13,14,18,21,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] It is understood that in moist air, the environmental cracking contribution is governed by hydrogen environment embrittlement. 20,27,[40][41][42] Water molecules from the bulk environment travel through the crack wake channel to the freshly exposed aluminum at the crack tip.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Incorporation of high‐altitude environmental effects in the linear elastic fracture mechanics‐based modeling of aluminum alloy 7075

Brown

Dorman

Burns

2022

Fatigue Fract Eng Mat Struct

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Airframe structural components experience coupled load-environment spectra that are currently not captured in traditional damage-tolerant management approaches. The effect of incorporating fatigue crack growth kinetics relevant to high-altitude flight environments into LEFM-based predictions of fatigue progression for aluminum alloy 7075-T651 was quantitatively assessed for a variety of load-environment spectra using AFGROW. The results of this study demonstrated that in all conditions, the incorporation of high-altituderelevant growth kinetics enhanced the fatigue life predictions. However, the magnitude of the impact on the overall life is dependent upon the subtleties of the coupled load-environment spectrum, despite the fact that environmental effects are most potent in the near-threshold regime of the da/dN versus ΔK relationship. The potential impact to the structural integrity management community is discussed, and remaining challenges and opportunities are identified.

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Environmentally Assisted Fatigue in the Gaseous Atmosphere

Hénaff

Sarrazin-Baudoux

2023

Comprehensive Structural Integrity

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Effect of water vapor pressure on fatigue crack growth in Al–Zn–Cu–Mg over wide-range stress intensity factor loading

Cited by 30 publications

References 74 publications

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Incorporation of high‐altitude environmental effects in the linear elastic fracture mechanics‐based modeling of aluminum alloy 7075

Environmentally Assisted Fatigue in the Gaseous Atmosphere

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