Modeling the Hydrogen Solubility in Liquid Aluminum Alloys

Abstract

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.

Understanding the hydrogen storage behavior of promising Al–Mg–Na compositions using thermodynamic modeling

“…The calculations made by Qiu et al [13] showed good agreement with experimental data for hydrogen solubility in fcc-Al and thermodynamic properties of AlH 3 . Later, thermodynamic modeling of hydrogen solubility in liquid Al was conducted by Harvey and Chartrand [15] using the MQM, showing better agreement with the available experimental data. Since MQM is used to describe the liquid phase in this work, the model parameters of Harvey and Chartrand [15] are used to describe the liquid phase in the present work.…”

“…Later, thermodynamic modeling of hydrogen solubility in liquid Al was conducted by Harvey and Chartrand [15] using the MQM, showing better agreement with the available experimental data. Since MQM is used to describe the liquid phase in this work, the model parameters of Harvey and Chartrand [15] are used to describe the liquid phase in the present work. The model parameters given by Qiu et al [13] for the AlH3 hydride and fcc-Al phase are also adopted in this work.…”

“…The constituent binary systems are modeled using the modified quasichemical model MQM for the liquid phase and the compound energy formalism for the solid solution phases. These binary systems are either taken from the literature [13][14][15] or from our previous work [2] or reassessed in the current work (AlNa). In many occasions, the models found in the literature were adjusted to suit dealing with hydrogen.…”

“…Harvey et al [14,15] reviewed the hydrogen solubility experimental data of Al-Mg liquid alloys and used them in assessing this system using the MQM. These authors [14,15] obtained good agreement with the experimental data from the literature [28][29][30][31][32]. Therefore, their model parameters of the Al-Mg-H liquid are adopted in this work.…”

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

“…Moreover, due to its high thermal diffusivity, the weld fusion and penetration are more difficult to achieve in comparison to steel [9]. The fast heat exchange implies also a fast solidification that leads to high stresses, resulting in cracks, pores formation or even complete break of the welded area [10][11][12][13][14].…”