Crescimento unidirecional da liga CBr4/CLC16, um modelo de analise da solidificação de ligas euteticas

AUTOR(ES)
DATA DE PUBLICAÇÃO

1993

RESUMO

The importance of composite materials for high technology applications increased remarkably during the past decades. Directional solidification of eutectic alloys is a very efficient technique for production of these materials, yielding high thermal stability composites with interesting magnetic, optic and eletric properties. Because of a peculiar solute segregation process two solids phases are formed in binary eutectic alloys growth. ln one of the phases the initial concentration of one component of the liquid decreases while the concentration of the other component increases. A similar process occurs to the other solid phase leading to a compositional gradient parallel to the solid/liquid interface. This provides a mass flux perpendicular to the growth direction that will determine the liquid composition near the solid/liquid interface and the final microstructure. The main goal of this work was to investigate the influence of directional solidification parameters during the growth of lamellar eutectic alloys. ln order to perform such simulation, an experimetal setup was assembled. To simulate the solidification of metals, transparent organic compound alloys were processed. This simulation allows one to study several process parameters, such as forced convection, solidification rate, and interface thermal gradient. The obtained results led to a well defined relationship between growth velocity and lamellar spacing. Also, the lamellar-growth stability was found to have intimate relation to the solid/liquid interface thermal gradient and, convective flux presence can improve the eutectic growth

ASSUNTO(S)

solidificação materiais ligas

ACESSO AO ARTIGO

Documentos Relacionados