Abstract
The effect of Mg on the sintering behavior of the aluminum alloy powder particles has been examined by using the deoxidization reaction of the Al2O3 surface film by Mg. When sintering an aluminum alloy green compact with relative density of 88%, the relative density of sintered material with and without Mg was 97% and 94%, respectively, that is, Mg was remarkably effective on sintering between aluminum alloy powder particles. It is considered that the solid phase diffusion of the aluminum atoms occurs at the interface between the primary particles during heating due to the deoxidization of the Al2O3 surface film by Mg. When the content of Mg increased, the pores located at the triangle junction of the primary particle boundary decreased and the mechanical properties, such as the tensile strength and elongation, were remarkably improved. The area of the dimple patterns at the fractured surface of the tensile specimen also increased.
