Attempt to predict hydrogen solubility limits in liquid multicomponent aluminum alloys

Anyalebechi, P. N.

doi:10.1016/1359-6462(95)00591-9

Cited by 34 publications

(23 citation statements)

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“…Correction factors for the effect of each alloying element CF(A) are introduced in Eq. [13]. Notice that the Wagner interaction parameters e X H for the alloying element X can be temperature dependent.…”

Section: ½4mentioning

confidence: 98%

“…Notice that the Wagner interaction parameters e X H for the alloying element X can be temperature dependent. Equation [13] also can be modified to use a polynomial function instead of a linear function to represent the effect of an alloying element on the hydrogen solubility.…”

Section: ½4mentioning

confidence: 99%

“…Calculated values of the solubility of hydrogen in different industrial alloys obtained in the present work and with the model of Anyalebechi [13] are summarized in Table III. All solute-solute interactions were taken from the compilation of COST 507 (European Commission, Belgium).…”

Section: Predictions In Multicomponents Systemsmentioning

confidence: 99%

“…Little hydrogen solubility data was found in the literature for ternary and multicomponent Al-based systems. [13][14][15] Previous work attempted to model the hydrogen solubility in aluminum alloys according to Wagner's interaction parameters formalism (WIPF) for the Al-Cu-H [16] and the Al-(Li, Mg, Ti, Zn, Si, Cu, Fe)-H systems, [17,18] the Hoch-Arpshofen's model was used for the Al-(Cu, Mg, Li, Si)-H system, [19] and the regular solution model was used for the Al-H system. [20] In this work, a thermodynamic model for the Al-(Li, Mg, Cu, Si, Zn)-H liquid alloys is developed to calculate the equilibrium hydrogen content of light metal alloys as a function of composition, temperature, and hydrogen partial pressure.…”

Section: Introductionmentioning

confidence: 97%

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Modeling the Hydrogen Solubility in Liquid Aluminum Alloys

Harvey

Chartrand

2010

Metall Mater Trans B

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The modeling of hydrogen solubility in multicomponent Al-(Li, Mg, Cu, and Si) liquid phase has been performed with a thermodynamic approach using the modified quasichemical model with the pair approximation (MQMPA). All hydrogen solubility data available in literature was assessed critically to obtain the binary parameters of the MQMPA model for the Al-H, Li-H, Mg-H, Cu-H, Zn-H, and Si-H melts. For the Li-H system, a new thermodynamic description of the stable solid lithium hydride was determined based on the c p found in literature. The thermodynamic model for the Al-Li system also was reassessed in this work to take into account the short-range ordering observed for this system. Built-in interpolation techniques allow the model to estimate the thermodynamic properties of the multicomponent liquid solution from the liquid model parameters of the lower order subsystems. A comparison of the calculated hydrogen solubility performed at various equilibrium conditions of temperature, pressure, and composition with the available experimental data found in the literature is presented in this work, as well as a comparison with some results from previous modeling.

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Section: ½4mentioning

confidence: 98%

Section: ½4mentioning

confidence: 99%

Section: Predictions In Multicomponents Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Modeling the Hydrogen Solubility in Liquid Aluminum Alloys

Harvey

Chartrand

2010

Metall Mater Trans B

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“…Considerable work in the past has focused on quantifying the amount of dissolved hydrogen in the aluminum melt. [9][10][11][12][13][14][15][16][17][18] Among these techniques, the reduce pressure test (RPT), also known as the Straube-Pfeiffer technique has been accepted widely in the aluminum foundry community. The RPT uses a liquid aluminum sample that is poured into a pressure-tight chamber.…”

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confidence: 99%

A Novel Characterization Technique to Determine Pore Susceptibility of Alloying Elements in Aluminum Alloys

Kumar

Sundarraj

2010

Metall Mater Trans B

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An investigation into the effect of ternary alloying element additions such as copper, magnesium, manganese, zinc, and nickel on pore formation in cast Al-12.6-wt pct Si eutectic alloy by employing a novel pore characterization technique is reported here. In this approach, the low-pressure testing method was combined with the metal foam manufacturing technique of intentionally adding TiH 2 , which enhances hydrogen pore formation and offers a method to distinguish the effect of individual alloying elements on hydrogen porosity formation.One of the major problems associated with the casting of aluminum alloys is the formation of microporosity-a leading cause in the reduction of bulk mechanical properties, [1] particularly fatigue performance and toughness, [2][3][4][5] as well as loss of pressure tightness in cast parts. The main causes of pore formation during casting are insoluble gas evolution and inadequate feeding to compensate volumetric shrinkage during solidification. The defects that result from these causes are referred to as gas and shrinkage porosity, respectively. Depending on the shape and morphology of pores, they can be distinguished. Rounded pores generally are classified as gas pores, whereas irregular pores in the interdendritic spaces are classified as shrinkage pores.Hydrogen has a significantly lower solubility in solid aluminum compared with liquid aluminum. During solidification, hydrogen is rejected at the solid-liquid interfaces, and it builds up in concentration in the interdendritic spaces. [6] When the hydrogen levels in these liquid spaces reach a critical supersaturation, which is determined by the hydrogen solubility in the liquid at that temperature, hydrogen pores nucleate on preexisting bubble nucleation sites such as the folded double oxide film. [7,8] With further rejection and diffusion of hydrogen, these pores begin to grow as the solidification proceeds. The final pore volume and pore size distribution in the cast product depends on the amount of initially dissolved hydrogen content in the melt. Considerable work in the past has focused on quantifying the amount of dissolved hydrogen in the aluminum melt. [9][10][11][12][13][14][15][16][17][18] Among these techniques, the reduce pressure test (RPT), also known as the Straube-Pfeiffer technique has been accepted widely in the aluminum foundry community. The RPT uses a liquid aluminum sample that is poured into a pressure-tight chamber. The sample is left there to solidify under reduced pressure. Under this condition, the growth of porosity is virtually unrestricted, and the amount of porosity that is created by a given amount of hydrogen gas is much larger compared with what is obtained under actual casting conditions. Thus, it is possible to arrive at a correlation between the initial hydrogen content and the final pore size under partial pressure using RPT. However, to demarcate clearly the effect of pore susceptibility of individual elements present in a ternary or a multicomponent Al alloy, the conventional RPT technique ...

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Analysis and Thermodynamic Prediction of Hydrogen Solution in Solid and Liquid Multicomponent Aluminum Alloys

Anyalebechi

2013

Essential Readings in Light Metals

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Attempt to predict hydrogen solubility limits in liquid multicomponent aluminum alloys

Cited by 34 publications

References 1 publication

Modeling the Hydrogen Solubility in Liquid Aluminum Alloys

Modeling the Hydrogen Solubility in Liquid Aluminum Alloys

A Novel Characterization Technique to Determine Pore Susceptibility of Alloying Elements in Aluminum Alloys

Analysis and Thermodynamic Prediction of Hydrogen Solution in Solid and Liquid Multicomponent Aluminum Alloys

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