Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 6, Pages 1565-1570Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.10.035
Keywords
Nanocrystalline metals; Deformation behavior; Magnesium; Twin; Grain boundary sliding
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Funding
- Korea Science and Engineering Foundation [2009-0076532]
- Defence Nano Technology Application Center
- Third Stage of Brain Korea 21 Project
- National Research Foundation of Korea [2009-0076532] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study investigates the deformation behavior of magnesium produced by hot extrusion of ball-milled powders in grains ranging from 120 mu m down to 60 nm in size. For microcrystalline magnesium, lattice dislocation interactions with grain boundaries and/or twin boundaries provide a Hall-Petch relationship between the flow stress and the grain size. The Hall-Petch slope is negatively deviated as the grain size is reduced below 1 mu m since twinning offers an additional deformation mode. As the grain size is further reduced below 100 nm, twinning is significantly suppressed and a portion of grain boundary sliding for plastic deformation increases, providing an inverse Hall-Petch relationship. Microstructure observation, a negligible strain hardening rate, a relatively high index of strain rate sensitivity. and a low activation volume in compression tests also demonstrate the particular deformation behavior of nanocrystalline magnesium. (C) 2009 Elsevier B.V. All rights reserved.
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