Microstructural Evolution of SiC_p/ZA27 Composite during Semi-solid Isothermal Treatment
The microstructural evolution of SiC p/ZA27 composite modified by Zr element was investigated during isothermal heat treatment at semi solid temperature,and compared with that of ZA27 alloy.The results indicated that the ideal microstructure for thixo forming of SiC p/ZA27 composite could be obtained through isothermal heat treatment for 30～40 min at 460℃.The speed of structural evolution of the composite was rapider than that of ZA27 alloy,and the structure coarsening phenomenon of the composite wasn't obvious when treated over 40 min.