Surface Roughening Mechanism of Polycrystalline Metal Sheet during Plastic Deformation : Effect of Strain Path on Surface Topography

概要

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A surface roughening phenomenon was investigated using commercially pure aluminium sheets deformed plastically along various proportional strain paths. Surface profiles were measured in three directions of a major principal strainε_1, a minor principal strain ε_2 and 45 degrees toε_1 direction. The mean value of R_a in the three directions could be expressed by the equation: R^^-_a = 3.14ε_d, where ε_d is an absolute value of principal strain vector in-plane, independently of the strain path. Both R_a and the wavelength λ_m at spectrum maximum showed a relatively large difference between ε_1 and ε_2 direction in the case of balanced bi-axial tensile path. The anisotropic geometry of surface topography corresponded with the direction of the maximum shear stress plane in the bulk metal.
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