Columnar to Equiaxed Grain Transition in Aluminium Alloys

ALICIA ARES; CARLOS SCHVEZOV

Sao Paulo

Conferencia; ABM-TMS Second Pan American Materials Conference - 2014; 2014

TMS - ABM

Aluminumbase alloys were solidified directionally and the position of the columnartoequiaxed transition (CET) determined on the vertical and horizontal sections of the ingots. The main parameters analyzed include the heat transfer coefficients, temperature gradients, growth rates, cooling rates and compositions. Vertical and horizontal watercooled solidification experimental setups were developed, and samples were solidified under directional flow conditions. Furthermore, the mechanical and electrochemical properties of each type of structure are studied. The results obtained in different aluminium alloy systems (AlCu, AlZn, AlSi, AlMg) are presented, analyzed and then, compared with the generally reported observations and theoretical models for predicting the CET.