SEMI-EMPIRICAL MODELING OF COLUMNAR AND EQUIAXED GROWTH WITH CET IN Al-Zn AND Zn-Al ALLOYS

ALICIA ESTHER ARES; CARLOS ENRIQUE SCHVEZOV

Sheffield, UK

Conferencia; 5° DECENNIAL INTERNATIONAL CONFERENCE ON SOLIDIFICATION PROCESSING; 2007

University of Sheffield

The importance of directional solidification studies has been well recognized since the early systematic scientific investigations carried out to understand the solidification characteristics of alloys. It is the purpose of this paper to present an analysis of equiaxed and columnar growth under different sample solidification conditions. The columnar and equiaxed growth of Al-Zn and Zn-Al binary alloys was studied in a wide range of concentrations. From temperature measurements a number of important dynamic parameters were derived, such as cooling rates, profiles, gradients and the position and velocity of liquidus and solid us fronts. These parameters were correlated with the structure-like length of columnar grains and size of equiaxed grains. These correlations were used to predict the solidification structure with the aid of a thermal model of solidification.