抄録
Machinability of Al-Si eutectic alloys containing small amount of additional element Na or Sr was studied by two dimensional and three dimensional cutting tests. In the range such as the good effect of modification is recognized, it has been confirmed that the addition of Na or Sr has a marvellous effect to the machinability (Cutting resistance, tool wear, cutting temperature, and surface roughness etc, ) of these alloys. It was especially cleared that the increase in shear angle has a favourable influence upon tool wear and surface roughness. But, it seems that a new question is raised from a standpoint of chip treatment.
