Materials Science Forum, Vol.439, 40-45, 2003
Porosity variation in the compressive deformation of pre-sintered Al-Si-Fe based alloy
The effects of temperature and strain rate on porosity variation have been studied in order to obtain an optimum processing condition in the powder forging of pre-sintered Al-Si-Fe based alloys. Compressive test was carried out at temperatures from 673 K to 813 K and at initial strain rates from 10(0) s(-1) to 10(-3) s(-1). The prior porosity of 15% in the pre-sintered alloy decreased with compressive deformation depending on temperature and strain rate. We have found that the amount of liquid phase containing Cu and Mg is closely associated with porosity changes of the present alloys deformed. It is suggested that the occurrence of liquid phase during the compressive deformation may facilitate the particle boundary sliding resulting in decreasing porosity in the pre-sintered Al-Si-Fe based alloys.