Dependence of twinned volume fraction on loading mode and Schmid factor in randomly textured magnesium. (15th May 2017)

• Record Type: Journal Article
• Authors: Čapek, Jan; Máthis, Kristián; Clausen, Bjørn; Barnett, Matthew
• Is Part Of: Acta materialia. Volume 130(2017)
• Page Start: 319
• Page End: 328
• Publication Date: 2017-05-15
• Subjects: Twinning -- Magnesium -- Neutron diffraction -- Schmid factor; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2017.03.017
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: The 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. Graphical abstract: Image