engleski

Solidification sequence of innovative AlSi7MgCu alloy

Conventional AlSi7Mg alloy is a frequent selection for complex geometry castings production. Designing of new chemical composition of AlSi7MgCu alloy with extra addition of Cu (up to 1.435 wt.%) represents a challenge in order to achieve advanced properties. A wide range of complex reactions and intermetallic phases occurs due to numerous alloying (Si, Mg, Cu) and trace elements (Fe, Mn) interaction. Determination of solidification sequence was performed by modeling of equilibrium phase diagram, simultaneous thermal analysis and metallographic investigations. Beside common intermetallic Al5SiFe, modified Chinese script phase Al15(FeMn)3(SiCu)2 also appears. Copper addition resulted in formation of compact complex intermetallic phases Al5Cu2Mg8Si6 and Al8FeMg3Si6. Solidification ended with secondary eutectic phases Mg2Si and Al2Cu.

AlSi7MgCu alloy ; copper ; thermal analysis ; microstructure ; solidification sequence

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