Surface Roughening and Fractal Dimension during Plastic Deformation of Polycrystalline Iron

抄録

In order to investigate the relationship between surface roughening and deformation of respective grains, three-dimensional observation of the roughened surface of polycrystalline iron during uniaxial compressive deformation was carried out. The pattern of grain boundaries and the contour map of the surface roughening were superimposed on a personal computer monitor. The three-dimensional surface roughness data were also high-pass-filtered to obtain detailed figures of the surface. The fractal dimension was introduced to characterize the change in three-dimensional surface roughening during plastic deformation. The box-counting method was adopted to measure the fractal dimension. It was found that three-dimensional surface roughening showed fractal characteristics. The value of the fractal dimension was almost constant with increasing applied strain.