| 초록 |
Neutron diffraction and elastic-viscoplastic self-consistent (EVPSC) model have been employed to understand deformation mechanisms during uniaxial tension and compression in a solid-solution-strengthened extruded Mg-9wt.%Al 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. Lattice strains and diffraction peak intensity variations are systematically measured during the mechanical testing in both textures, in order to investigate the micromechanical responses between different grain orientations in the bulk sample. The simulations predict the macroscopic stress-strain relationship and neutron lattice-strain data, by providing the relative activities of the available slip and twinning modes during the course of the test. The results provide insights into the effects of texture and load direction on the activation of the deformation modes in the magnesium alloy. |
