Abstract
To get an insight into the residual sodium content of Al–Mg alloys, three types of sodium-containing fluxes were introduced into the melt with different magnesium content. The increment, existing form and distribution of sodium in Al–Mg alloys with different magnesium content were analyzed. The results show that the influence of different sodium salts on the increment of sodium in Al–10Mg alloy is significantly different. The NaF raised the sodium level in Al–10Mg alloy to the highest extent, Na3AlF6 coming second, and NaCl did not have an obvious influence. The magnesium element in the aluminum melt was found to be the key factor leading to the increment of sodium level. After the salt fluxing treatment of aluminum alloy with different magnesium content, this increment would be proportional to the content of magnesium. EDS mapping indicates the sodium introduced by the fluxes was distributed in the form of Na-rich particles in Al–Mg alloys and preferentially located near Al3Mg2(β) phase in the situation of high magnesium content.
Highlights
Oxide inclusions are usually considered as one of the fundamental defects detrimental to the performances of aluminum alloys
When the salt fluxes are brought in contact with molten aluminum, the aluminum will pick up some impurities due to the exchange reactions between the fluxes and the melt [1]
In order to further clarify the principle of composition design of flux for Al–Mg alloy, it is necessary to study the influence of different sodium-containing fluxes on the residual sodium content of aluminum alloys with high magnesium content
Summary
Oxide inclusions are usually considered as one of the fundamental defects detrimental to the performances of aluminum alloys. In order to further clarify the principle of composition design of flux for Al–Mg alloy, it is necessary to study the influence of different sodium-containing fluxes on the residual sodium content of aluminum alloys with high magnesium content. The existing form and distribution of sodium in Al–Mg alloys have still been controversial, and there are few studies on the effect of sodium salt in fluxes on the residual sodium content in Al–Mg alloys. The present study aims to provide an experimental basis for the design of appropriate salt fluxes used for Al–Mg alloys It intends to shed a light on ways to avoid high-temperature brittleness
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