Original scientific paper

Possibilities of Fe-RICH phases elimination with using heat treatment in secondary Al-Si-Cu cast alloy

L. Hurtalová ; Faculty of Mechanical Engineering, University of Žilina, Žilina, Slovakia
E. Tillová ; Faculty of Mechanical Engineering, University of Žilina, Žilina, Slovakia
M. Chalupová ; Faculty of Mechanical Engineering, University of Žilina, Žilina, Slovakia

Abstract

The mechanical properties of Al-Si-Cu cast alloy are strongly dependent upon the morphologies, type and distribution of the second phases. The skeleton like – Al₁₅(FeMn) ₃Si₂ and needles - Al₅FeSi phases were observed in experimental material AlSi9Cu3. The Fe-rich phases morphology was affected with applying two types of heat treatment; T4 and T6, which caused positive changes of mechanical properties especially ultimate tensile strength; gives that for as cast state was R_m = 211 MPa, than at optimum T4 (515 °C/ 4 hours) was R_m = 273 MPa and at optimum T6 (515 °C/ 4 hours with artificial aging 170 °C/ 16 hours) was R_m = 311 MPa.

Keywords

Al - Si - Cu cast alloy; heat treatment; mechanical properties; microstructure; Fe-rich phases

Hrčak ID:

126669

URI

https://hrcak.srce.hr/126669

Publication date:

1.1.2015.

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