Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 583, Issue -, Pages 220-231Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.07.003
Keywords
Magnesium alloys; Rare-earths; Extrusion; Mechanical behavior; Slip; Twinning
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Funding
- Spanish Ministry of Science and Innovation [MAGNO2008-1028-CENIT]
- National Science Foundation Division of Material Research [DMR1107117]
- Spanish Ministry of Economy and Competitiveness through the Materials Network program [PRI-PIBUS-2011-990, PRI-PIBUS-2011-917]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1107117] Funding Source: National Science Foundation
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The mechanical behavior of an extruded magnesium-manganese alloy containing 1 wt% of neodymium (MN11) has been investigated at temperatures ranging from room temperature to 400 degrees C at both quasi-static and dynamic rates. Conventional ex-situ tests, carried out in compression along the extrusion axis (EA), have been combined with in-situ tests in a scanning electron microscope (SEM) in order to elucidate the effect of a rare earth (RE) addition on the dominant deformation mechanisms. An unusually large activity of twinning was observed at room temperature in a wide range of quasi-static rates. Furthermore, the twinning activity has been found to increase at temperatures around 250 degrees C, where clear signs of dynamic strain aging (DSA) are also apparent. The enhanced twinning activity compared to conventional Mg alloys, not containing RE elements, is attributed to an increase in the critical resolved shear stress of basal slip (CRSSbasal) due to the presence of intermetallic RE-containing particles and to the Nd atoms in solid solution. The surprising decrease of the twinning activity at dynamic rates (similar to 10(3) s(-1)) may be explained by a decrease in the CRSSbasal as the intermetallic RE-containg particles and the Nd solid solution strengthening become less effective with increasing strain rate. (c) 2013 Elsevier B.V. All rights reserved.
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