Metallurgy, Vol. 54 No. 1, 2015.
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 Rm = 211 MPa, than at optimum T4 (515 °C/ 4 hours) was Rm = 273 MPa and at optimum T6 (515 °C/ 4 hours with artificial aging 170 °C/ 16 hours) was Rm = 311 MPa.
Keywords
Al - Si - Cu cast alloy; heat treatment; mechanical properties; microstructure; Fe-rich phases
Hrčak ID:
126669
URI
Publication date:
1.1.2015.
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