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

0475684 - ÚJF 2018 RIV GB eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GB14-36566G
Institucionální podpora: RVO:61389005
Klíčová slova: twinning * magnesium * neutron diffraction * Schmid factor
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 6.036, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0272339