Role of Mechanical Stirring of Al-Mg Melt in the Healing of Bifilm Defect

Bagherpour-Torghabeh, Hamed; Raiszadeh, Ramin; Doostmohammadi, Hamid

doi:10.1007/s11663-017-1067-9

Cited by 12 publications

(1 citation statement)

References 14 publications

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“…This indicates that the size, number and structure of bifilms are changing. Raiszadeh [4][5][6][7][8][9][10][11][12] has carried out an extensive work where a bubble was trapped in the liquid aluminum. The change in the volume of the bubble with regard to the oxidation of the bifilm due to the air consumed between the folded films was recorded.…”

Section: Resultsmentioning

confidence: 99%

Archives of Foundry Engineering

Gursoy,

Nordmak,

Syvertsen

et al. 2020

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Porosity is one of the major problems in casting operations and there are several discussions in the literature about the porosity formation in aluminum castings. Bifilms are the defects that are introduced into the melt by turbulence. They can be detected with reduced pressure test and presented numerically by measuring bifilm index. The measure of bifilm index is the sum of total oxide length given in millimeters from the cross-section of reduced pressure test sample solidified under 0.01 MPa. In this work, low pressure die casting (LPDC) unit was built in an attempt to enhance the producibility rate. The unit consists of a pump housing that was placed inside the melt in the melting furnace where the pressure was applied instead of the whole melt surface. It was observed that the melt quality of A356 alloy was deteriorated over time which had led to higher porosity. This was attributed to the increased oxide thickness of the bifilm by the consumption of air in between the folded oxides. A relationship was found between bifilm index and pore formation.

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