抄録
In order to investigate the influence of second-phase particles on chip breakability of aluminum alloys, turning test for various wrought aluminum alloys were carried out with carbide inserts (K10) in dry and wet cutting conditions. In the materials, Al_2Cu, Al_6Mn, Mg_2Si, Al-Fe-Si system compound and eutectic Si were observed as second-phase particles. Chip breakability of materials which containing Al_2Cu or Si as second-phase particles were superior than that of materials with Mg_2Si or Al-Fe-Si system compound. This tendency was more prominent in wet cutting than in dry cutting. The Al_2Cu and Si particles on the machined surface were fractured by cutting tool in machining. It was estimated that those fractured second-phase particles acted as nucleus of chip breaking during machining. Moreover, the increase of the chip breakability in wet cutting was attributable to the promotion of fracture of Al_2Cu and Si particles due to the Rehbinder effect.
