Co-Cu and Fe-Cu alloy specimens with low liquid content have been prepared by sintering mixtures of fine powders at 1200℃ for 30 min. When they are reheated to 1200℃ in liquid bath of the same composition as the matrix, liquid penetrates between the solid grains. With the increase of liquid content in the sintered specimens, the grains become more sperical and finally become separated from each other. Rapid grain coarsening also occurs. The liquid penetration rate is higher in Co-Cu alloy with O dihedral angle than in Fe-Cu with an average dihedral angle of about 30℃. The driving force for liquid penetration is attributed to the tendancy for the grains to become spherical when the liquid menisci between grains on the specimen surface are removed in liquid bath. The process of grain separation is also discussed.
