期刊
ACTA MATERIALIA
卷 87, 期 -, 页码 56-67出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.12.030
关键词
Magnesium; Twinning; Dislocations; High strain rate; Texture
资金
- NSF DMR Materials World Network program
- MEDE CRA, US Army Research Laboratory
- Army Research Laboratory
- [W911NF-12-2-0022]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1008144] Funding Source: National Science Foundation
The mechanical behavior of extruded pure magnesium was studied experimentally under high strain rate (10(3) s(-1)) compression loading in the extrusion direction. Electron back scattered diffraction was used to examine the changes in the texture and transmission electron microscopy was used to investigate the dislocation structures in the material. Extensive grain reorientation due to extension twinning is observed. Dislocation activity is observed inside the parent region ([a] slip) as well as the twinned region ([c + a] slip). The high degree of strain hardening observed is postulated to be due to the texture hardening associated with extension twinning coupled with significant increase in the dislocation density with strain. In compression along the extrusion direction, extension twinning and dislocation activity are both needed to accommodate plastic deformation. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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