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New short T6 heat treatments for aluminium silicon alloys obtained by semisolid forming
Menargues Muñoz, Sergi; Martín Fuentes, Enrique; Baile Puig, Maria Teresa; Picas Barrachina, Josep Anton
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CDAL - Centre de Disseny d'Aliatges Lleugers i Tractaments de Superfície
In this work the heat treatment response of SSM processed A356 and A357 casting alloys was analysed. The development of a new T6 heat treatment, with solution times less than 30 mm has been allowed. In this new short heat treatment, the alloy showed better mechanical properties compared to the same alloy which heat treated in standard conditions (solution time between 6 h and 8 h). This new heat treatment, carried out at the solution temperature of 540 degrees C, enabled the complete magnesium dissolution, while minimizing the grain growth of the alpha-phase and the eutectic silicon. Although this experiment was carried out on A356 and A357 aluminium alloys, conformed by Sub-Liquidus-Casting process (SLC), the results may be applied to the components produced with other semi-solid technologies or others Al-Si hardenable alloys that form coherent magnesium inter-metallic precipitates. (C) 2014 Elsevier B.V. All rights reserved.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials compostos
Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
Aluminum-silicon alloys
Metals--Heat treatment
Semi-solid process
T6 heat treatment
Aluminium alloys
Microstructure
Hardness
SI-MG ALLOYS
CASTING ALLOYS
MECHANICAL-PROPERTIES
MICROSTRUCTURE
BEHAVIOR
A356
Alumini -- Aliatges
Metalls -- Tractament tèrmic
Alumini -- Propietats mecàniques
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