كنترل ريزساختار تركيبات بين فلزي حاوي آهن با افزودن منگنز و انجام عمليات حرارتي محلول سازي در آلياژ 319 آلومينيوم

Microstructure Control of Iron Bearing Intermetallies in 319 Aluminium Alloy via Mn Addition and Solution Heat Treatment

Some experiments were conducted to investigate the formation of iron bearing intermetallics in 319 aluminium alloy at different levels of iron and manganese. Also, the influence of solution heat treatment at 515°C for various solutionizing times up to 26h on the size and morphology of iron bearing compounds was determined. The results showed that in the presence of Mn, Alpha iron bearing intermetallics are formed in Chinese script and polyhedral morphologies and so, the addition of Mn in a sufficient level neutralizes the effect of Fe in the formation of Beta-needle phase. The dissolution of Alpha-Chinese script and a-polyhedral phase were seen in the alloy solution heat treated at 515°C. Also, it was confirmed that the solutionizing of the alloy can change the morphology of a phase from polyhedral to Chinese script. However, the dissolution of Alpha phase occurs by the rejection of Si atoms from Alpha.