ISSUE 3/2013

/// 01
Akhtar, S.; Shaikh, R. H.; Aune, R. E.; Arnberg, L.
Mechanism of micro porosity in directionally solidified A356 castings doped with anodized plates and sintered aluminium

Porosity is considered to be one of the most serious defects in aluminium alloy components affecting both static and dynamic properties. The formation of porosity in aluminium alloys is primarily attributed to complex interaction of the oxides in the metal and the hydrogen content. The present work was undertaken to study the mechanism of porosity formation in a commercial A356 alloy by the addition of recycled anodized scrap and sintered aluminium powder. Directionally solidified castings were produced by using A356 alloy as the base metal and doping it with 5 % recycled anodized scrap and 5 % sintered aluminium powder. The amount and size of pores formed, as well as the shape and distribution of resulting porosity was characterized. The volume and area percentage porosity was found to increase as a result of the addition of recycled anodized scrap and sintered aluminium powder. It was also established that the pore size and number of pores increased with an increasing distance from the chill. Scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) analysis shows the pores are associated with the oxide films.




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