Directional Solidification and Characterization of Zn-Al, Zn-Ag and Zn-Al-Ag Alloys

A. E. ARES; S. F. GUEIJMAN; C. E. SCHVEZOV

Río de Janeiro, Brasil.

Conferencia; 11th INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS (ICAM 2009) / VIII ENCONTRO SBPMat; 2009

International Union of Materials Research Society (IUMRS)

Zinc-Aluminum,  Zinc-Silver  and  Zinc-Aluminum-Silver  alloys  have  been  directionally  solidified  and  analyzed. Several correlations were  found between  thermal parameters  (cooling  rate,  temperature gradient and  interphase velocity), grain size, dendritic spacing and microhardness  in directional  solidified  samples which present different  types of  structures: columnar, equiaxed and  columnarto-equiaxed  transition  (CET).  The  correlation  between  cooling  rate  and  dendritic  spacing,  density  of grains  and temperature gradient in columnar and equiaxed grains were analyzed. Also, correlations between grain size and dendritic arm spacing and the variations in microhardness were investigated as a function of both type of microstructure and load applied.