Effect of initial temperature on actual elemental evaporation rate in Al-Si-Cu mixture during free cooling in near-vacuum conditions

Modeling of Impurities Evaporation Reaction Order in Aluminum Alloys by the Parametric Fitting of the Logistic Function

“…They also documented alterations in the chemical composition of specific non-alloying components. Following that, Mitrašinović and D'Souza [25] verified that the Al7Si4Cu alloy underwent a discernible change in chemical composition when it cooled from 760 • C at 2.1 kPa, despite that they only created low pressure during the solidification phase and at comparatively low temperatures. Thus, the concentration drop of various harmful elements from the aluminum alloy held in vacuum appears to be a viable assumption.…”

“…The generalized reduction gradient approach (e.g., the nonlinear optimization procedure included in the Microsoft Excel Solver add-in) is used to determine the constants of the logistic function. While it is assumed that up to the temperature of 597.1 • C the chemical composition of the aluminum alloy did not change [25], results at temperatures of 610 • C, 660 • C, 710 • C, and 760 • C were utilized in the analysis of experimental data to optimize the computed evaporation rate values. Minimized square values, given in Table 3, are calculated as:…”

Thermodynamic and kinetics investigation of elemental evaporation from molten Al7Si4Cu alloy

“…Kumar and Sundarraj [9] suggested a combination of the foaming technique and low pressure for porosity assessment in Al-Si eutectic alloys and also reported changes in the chemical composition of some non-alloying elements. Subsequently, Mitrašinović and D'Souza [10] confirmed a noticeable change in chemical composition in Al7Si4Cu alloy naturally cooled from 760 o C at 2.1 kPa although they induced low pressure only during the solidification period and at relatively low temperatures. Hence, the concentration decrease of various unwanted constituents from the aluminum alloy kept in low vacuum conditions seems to be a viable assumption.…”