多結晶金属の繰返し塑性変形の表面あれ三次元測定システムによる観察

概要

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Detailed observation of inhomogeneous deformation of polycrystalline metals and roughening of free surface under cyclic strain is important for basic research on the study of mechanisms of microscopic deformation, as well as on that of fatigue damage. Two-dimensional surface roughness and three-dimensional microscopic shapes of free surfaces of annealed copper and iron specimens were measured during cyclic plastic deformation with four-point bending. The relationship between the change in the three-dimensional surface shape and the behaviour of respective grains was observed with a mapping technique. It was found that the surface roughness changes with the cycle during the half-cycle of deformation, and the maximum and the minimum values of the surface roughness in a cycle increased gradually with the number of cycles. It was observed from the three-dimensional analysis that surface irregularities such as mountains and valleys caused by tensile and compressive strain are reversed in their shapes with the reversal of strain. The irregularity of surface with cyclic plastic deformation seems to be caused by preferential deformation in some specific areas or grains.
1993-11-25