Abstract
Dehydrogenation of the 2195 Al–Li alloy was accomplished using argon degassing, ultrasonic degassing, and vacuum degassing. The concentration of hydrogen, its microstructure, and its mechanical characteristics were all investigated. The hydrogen content in the 2195 Al–Li alloy is high. The degassing process significantly improved the mechanical properties of the cast alloy, owing the removal of hydrogen. Among the three degassing techniques, ultrasonic argon treatment was an efficient dehydrogenation approach and an effective procedure for enhancing the microstructure while minimizing lithium loss in the Al–Li alloy. On the one hand, ultrasonic waves can dissolve purged argon bubbles, allowing them to degas more efficiently. On the other hand, ultrasonic waves may cause a large number of cavitation bubbles to form in the melt, which should be the cause of the microstructure refinement. The dynamics of rising argon bubbles and ultrasonic effects are involved in ultrasonic argon treatments such as cavitation and flow.
Highlights
Casting on the Hydrogen and Hydrogen content is one of the indicators of an aluminum alloy’s casting quality, and its presence reduces the mechanical properties of cast products
Vacuum degassing was less effective than ultrasonic degassing but was more efficient than single argon degassing
The 2195 Al–Li alloy melt was subjected to argon degassing, ultrasonic degassing, and various pressure vacuum degassing settings in this study
Summary
Casting on the Hydrogen and Hydrogen content is one of the indicators of an aluminum alloy’s casting quality, and its presence reduces the mechanical properties of cast products. Hydrogen may be released from the solution, or the difficulty of feeding liquid metal through the interdendritic area may cause porosity in the casting [1]. The only gas that can dissolve in molten aluminum is hydrogen [2]. In foundries, the control of dissolved hydrogen in the melt is highly challenging. Degassing is the most efficient method for lowering hydrogen porosity. Some of the methods used include nitrogen, argon, or a combination of both, as well as chlorine and hexachlorophene (C2Cl6) tablets [3]
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