Direct diffraction measurement of critical resolved shear stresses and stress localisation in magnesium alloy

0539464 - ÚJF 2022 RIV CH eng J - Journal Article
Baczmanski, A. - Kot, P. - Wroński, S. - Wrobel, M. - Wronski, M. - Pilch, Jan - Muzyka, M. - Wierzbanowski, K. - Zhao, Y. - Le Joncour, L. - Francois, M. - Panicaud, B.
Direct diffraction measurement of critical resolved shear stresses and stress localisation in magnesium alloy.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 801, JAN (2021), č. článku 140400. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA MŠMT LM2015056
Research Infrastructure: Reactors LVR-15 and LR-0 - 90074; CANAM II - 90056
Institutional support: RVO:61389005
Keywords : neutron diffraction * stress localisation * Slip systems * self-consistent modelling * elastopastic deformation * magnesium alloys
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.044, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.msea.2020.140400

The main purpose of this work is to develop neutron diffraction methodology in order to determine stresses localised in polycrystalline grains during elastoplastic deformation, directly from experiment. As a result, for the first time, the von Mises stress for chosen grain orientations and Critical Resolved Shear Stresses (CRSS) for active slip systems were unambiguously measured without the help of crystallographic models, which introduce different theoretical assumptions. The stresses measured for groups of grains and the determined CRSS values are important characteristics of a material, which allow to study plastic deformation in textured material at different scales: slip system and grain, which play a key role in mechanical properties and formability of the material.

The new method was successfully tested and applied to textured AZ31 alloy subjected to tensile deformation and the components of stress tensor were for the first time determined from measured lattice strains corresponding to chosen orientations of crystallite lattice. The obtained results positively verified hypotheses that, during plastic deformation, a large difference in the hardness as well as in the localised stresses occurs for grains having different lattice orientations. It was found directly from experiment that, the activation of basal glide, having small CRSS, does not lead to significant plastic deformation, and the activation of other non-basal systems (with higher CRSS) induces the development of plasticity at the macroscopic scale. The early plastic deformation occurring due to slip on basal system is small but it can destructively affect fatigue life, limiting applicability of the material for structural components. Finally, the comparison of experimental results with a modified version of Elastic-Plastic Self-Consistent (EPSC) model showed its capability to simulate the mechanical behaviour of such materials.
Permanent Link: http://hdl.handle.net/11104/0317219