The effect of hydrogen embrittlement on the mechanical properties of aluminum alloy

Bochkaryova, A V; Li, Yulia; Баранникова, С. А.; Зуев, Л. Б.

doi:10.1088/1757-899x/71/1/012057

Cited by 15 publications

(11 citation statements)

References 13 publications

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“…Almost all metals contain small amounts of oxygen, hydrogen and nitrogen in their composition, which are often referred to as gases in metals [1,2], whether or not they exist as oxides, hydrides and nitrides [3][4][5]. The deleterious effects of hydrogen on mechanical properties of metals are well known and have been extensively studied [5][6][7][8][9].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Proposed HE mechanisms are often speculative due to the difficulty in quantifying hydrogen levels accurately, although four main mechanisms are often discussed in the context of Al alloys. Hydriding has been detected in some Mg containing phases of aluminium and could potentially lead to brittle GBs [7]. Hydrogen-enhanced local plasticity (HELP) is a complex phenomenon involving high localised H concentrations increasing dislocation mobility by shielding dislocation interactions.…”

Section: Hydrogen Embrittlementmentioning

confidence: 99%

Modelling Hydrogen Embrittlement using Density Functional Theory: A theoretical approach to understanding environmentally assisted cracking in 7xxx series aluminium alloys

2020

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The effects of H segregation to a Σ11 symmetric tilt Al grain boundary are investigated using atomistic simulations, as part of a wider study on cracking in 7xxx series alloys. Density functional theory based simulations of uniaxial straining of grain boundaries containing 11 different concentrations of H were performed under the cohesive zone fracture mechanics framework. The theoretical strength of grain boundaries is shown to be supressed by H segregation, and the cause of this is attributed to the prevention of the formation of Al ligaments across grain boundaries. Segregated concentrations of relevant alloying elements (Zn, Mg, and Cu) show minimal impact on the H embrittlement process investigated, namely H enhanced decohesion (HEDE). Further modelling, of H transport and grain boundary precipitates, is required to confirm the validity of the HEDE mechanism in the case of 7xxx alloys.

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“…Material's mechanical properties are affected by its elements content [26]- [28]. Sulfur addition to the DOI : http://dx.doi.org/10.31963/intek.v8i2.2817 aluminum liquid significantly increases tensile strength, hardness, wear-resistance, and friction coefficients [26].…”

Section: Introductionmentioning

confidence: 99%

“…Sulfur addition to the DOI : http://dx.doi.org/10.31963/intek.v8i2.2817 aluminum liquid significantly increases tensile strength, hardness, wear-resistance, and friction coefficients [26]. The aluminum alloy's addition of silicon content will lower the aluminum's liquid point and increase its fluidity and tensile strength [28]. This research will be studied about sand with certain wetness as a cooling medium toward the fatigue characteristics steel material AISI 4140.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Characteritics of Medium Carbon Steel after Heat Treatment Using Sand as Cooling Media

Sunardi

Randu

Listijorini

et al. 2021

Intek

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Stress concentrations cause many machine element failures. Failure will occur more rapidly if the machine elements obtain repeated and fluctuating loading. For this reason, the material for machine elements must have better fatigue life. There are various attempts made to increase material life and other mechanical properties. In this study, the research sample used is AISI 4140 steel. The samples obtain hardening followed by cooling and tempering. The hardening temperature is 8500C with a holding time of 17 minutes. The cooling media in this research are dry sand, semi-wet sand, and wet sand. Wet measurements based on volumetric ratios. Semi-wet sand with a ratio of sand and water 4: 1, sandy sand 4: 2. The final process is tempering treatment, with a temperature of 2500C. The material fatigue test refers to the JIS Z 2274 Standard. From this study, the heat treatment given can reduce the fatigue life of the material, even though the hardness increases. The higher the cooling rate, the hardness of the material increases, but the fatigue life is low.

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The effect of hydrogen embrittlement on the mechanical properties of aluminum alloy

Cited by 15 publications

References 13 publications

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Modelling Hydrogen Embrittlement using Density Functional Theory: A theoretical approach to understanding environmentally assisted cracking in 7xxx series aluminium alloys

Fatigue Characteritics of Medium Carbon Steel after Heat Treatment Using Sand as Cooling Media

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