IMAM   24519
INSTITUTO DE MATERIALES DE MISIONES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Structure Evolution of Zinc-Aluminum Alloys in the Semi-solid State
Autor/es:
WILKY DESROSIN; CARLOS E.SCHVEZOV; MARIO ROSENBERGER; ALICIA E. ARES
Lugar:
San Paolo
Reunión:
Conferencia; ABM-TMS Second Pan American Materials Conference - 2014; 2014
Institución organizadora:
TMS - ABM
Resumen:
Semi-solid processing of alloys is an alternative to regular casting for small components at a lower cost. The SIMA process has been developed and used for semi-solid process of ZA27 alloys. The optimum processing route requires the control of the semisolid structure to be at a specific solid fraction and size of the solid grains. In order to investigate the process of ZA alloys in a range of compositions experiments were carried out with the more common alloy as the ZA27. Cast alloys of ZA 27 were deformed between 30 to 80 % by compression and heat treated at two temperatures of 440 ºC and 445 ºC in the mushy region during total periods of time between 45 min to 360 min. The heat treatment was discontinuous and the samples were polished and analyzed after each step. The results are presented showing that for this alloy a thermal treatment at 445 ºC produce a better semisolid structure than at 440 ºC. The effect of degreeof deformation, temperature and time of treatment on the microstructure evolution including solid fraction, size distribution and alfa and beta phases distribution a nd fraction is determined and analyzed.