Effect of the loading mode on the evolution of the deformation mechanisms in randomly textured magnesium polycrystals – Comparison of experimental and modeling results. (September 2015)

• Record Type: Journal Article
• Authors: Máthis, K.; Csiszár, G.; Čapek, J.; Gubicza, J.; Clausen, B.; Lukáš, P.; Vinogradov, A.; Agnew, S.R.
• Is Part Of: International journal of plasticity. Volume 72(2015:Sep.)
• Page Start: 127
• Page End: 150
• Publication Date: 2015-09
• Subjects: A. Twinning -- B. Polycrystalline material -- B. Crystal plasticity -- C. Nondestructive evaluation; Plasticity -- Periodicals; Plasticité -- Périodiques; Plasticity; Periodicals; 620.11233
• DOI: 10.1016/j.ijplas.2015.05.009
• Languages: English
• ISSNs: 0749-6419

Abstract

Abstract: A detailed analysis of the loading mode dependence of the deformation mechanisms in randomly textured cast magnesium is presented. An elasto-plastic self-consistent model (EPSC) is used to model the dislocation slip and twinning activity, respectively. The results are quantitatively compared with experimental data obtained by in-situ neutron diffraction (ND) and acoustic emission (AE). Both EPSC calculations and ND line profile analysis show an increased activity of prismatic slip with increasing strain and a loading mode dependence of the activation of the second-order pyramidal slip. The AE measurements and the modeling indicate a difference in the number of nucleated twin variants and the twinned volume in tension and compression. Highlights: Macroscopic yield is accompanied by increase of non-basal < a > dislocations. The < c+a > slip is more significant in compression than that in tension. Good agreement between EPSC modeling data and in-situ experiments.