COLUMNAR-TO-EQUIAXED GRAIN TRANSITION IN ALUMINUM ALLOYS

ALICIA E. ARES; CARLOS E. SCHVEZOV

Sao Paulo, Brasil

Conferencia; PAN AMERICAN MATERIALS CONFERENCE 2014 - Light Metals and Alloys Symposium; 2014

Asociación Brasilera de Materiales (ABM)

Aluminum-base alloys were solidified directionally and the position of the columnar-to-equiaxed 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 water-cooled 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 (Al-Cu, Al-Zn, Al-Si, Al-Mg) are presented, analyzed and then, compared with the generally reported observations and theoretical models for predicting the CET