| 초록 |
Numerous investigations have recently been carried out to understand deformation mechanisms of magnesium and its alloy at room temperature, because slip and twinning as deformation modes are activated simultaneously during deformation. In this study, neutron diffraction is employed to investigate the micromechanical responses of various grain orientations during uniaxial tension and compression in solid-solution-strengthened extruded Mg-1wt.%Zn alloy. Two starting textures are used: 1) the as-extruded then solutionized texture, T1, in which the {00.2} basal planes in most grains are tilted around 20~30° from the extrusion axis, and 2) a modified texture, T2, in which the basal planes are preferentially oriented perpendicular to the extrusion direction. The diffraction peak intensity variations and lattice strains of various grain orientations are monitored in situ during deformation. In addition, elastic-viscoplastic self-consistent (EVPSC) modeling is used to predict the macroscopic stress-strain responses, microscopic lattice strain evolution, and relative activities of slip and twinning modes during the course of the test. The results discuss with the loading-direction dependence on the activation of deformation modes of magnesium alloys. |
