Dependence of twinned volume fraction on loading mode and Schmid factor in randomly textured magnesium

0475684 - ÚJF 2018 RIV GB eng J - Journal Article
Čapek, Jan - Máthis, K. - Clausen, B. - Barnett, M.R.
Dependence of twinned volume fraction on loading mode and Schmid factor in randomly textured magnesium.
Acta Materialia. Roč. 130, MAY (2017), s. 319-328. ISSN 1359-6454. E-ISSN 1873-2453
R&D Projects: GA ČR GB14-36566G
Institutional support: RVO:61389005
Keywords : twinning * magnesium * neutron diffraction * Schmid factor
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.036, year: 2017

he twinning activity in random textured cast magnesium during room temperature tension and compression tests was monitored by neutron diffraction (ND). Variation of integrated intensities of selected diffraction peaks, characterizing the twinned volume in particularly oriented grains was compared with calculated Schmid factors for extension twinning of these grains. It is shown that in tension there is a direct proportion between the twinned volume and the maximum value of the Schmid factor for a given grain orientation. In contrast, in compression this relation is not valid. The twinned volume in this case is influenced by both deviation of the grain from the ideal orientation and its rotation around the c-axis. The experimental results are in good agreement with those obtained from elasto-plastic self-consistent (EPSC) modeling.
Permanent Link: http://hdl.handle.net/11104/0272339