Abstract
Deformation behavior of adjacent crystal grains of a metal is observed using speckle interferometry. Coarse grained aluminum specimens which have two crystal grains in the observation region are made by a thermo-mechanical treatment for the observation by speckle interferometry. Grain boundaries are arranged 0°, 45° and 90° for the loading direction. Crystal orientations are measured by electron backscatter diffraction. Tensile tests are performed and the in-plane and the out-of-plane deformation behaviors of the specimen surfaces are observed using speckle interferometry. As the results, strain maps of ε_x, ε_y, and γ_<xy>, are obtained and heterogenous deformation behaviors in each crystal grain can be observed. Various values of yield stresses and strains of each crystal grain in each specimen are obtained. The values depend on Schmidt factor obtained from the crystal orientation analysis. A tendency of the variation to decrease with decreasing the angles of the grain boundaries is obtained. Therefore, the experimental investigation of deformations of adjacent crystal grains is made possible by speckle interferometry.
