抄録
The small and hard particles exist in particle dispersion hardened aluminum alloys. Those cause the complex cutting mechanism. Then the new materials were developed to improve that problem recently. It was necessary to clarify their cutting mechanism. In this study, the micro cutting in the SEM was carried out and the strain rate was calculated from the in-situ observation images using the PIV (Particle Image Velocimetry) in order to make clear the cutting behavior in cutting aluminum alloys including the new material. The main results obtained are as follows : Using the PIV, the displacement in the sub micro meter order was measured and the cutting behavior in the micro cutting could be clarified. In cutting of the AFT and the AST, the chip formation and the strain rates along the shear plane were made clear. In cutting of 19Si, when the particle impacted the cutting edge, the matrix began to deform before the particle was divided. It was clarified that the matrix around the particle was deformed widely and it played the role of the cushion.
