Abstract
The stress-strain characteristics and plastic behaviors of Aluminum alloy were examined by tensile test and infrared thermo-viewer. Al-Mg FCC polycrystalline sheet plates (crystal grain size d=12, 42, 3000μm) were used. The effect of grain size and initial orientation distribution on the harding evolution, strain localization and crystal rotation by using X-ray diffraction and ODF analyses. Furthermore, the behaviors of the plastic deformation and the fracture were continuously observed by using the thermo-viewer in order to make clear the effect of the different crystal grain sizes on macroscopic local plastic behavior. The results obtained in this study are summarized as follows; (1) The strength level increase with decreasing crystal grain size, (2) The lager crystal grain, the quicker the strain localization occurs, (3) By making differential thermal images, a macroscopic local plastic deformation can be estimated.
