Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 28, Pages 7607-7610Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.04.099
Keywords
Metals and alloys; Mechanical properties; Microstructure; Twinning; Portevin Le Chatelier effect
Categories
Funding
- National Science and Technology supporting program of China [2006BA104B04-1, 2006BAE04B07-03]
- The Science and Technology Supporting Project of Changchun City [2007KZ05]
- Jilin University
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The small serrated flow, severe Portevin Le Chatelier ( PLC) phenomenon and abnormal strain rate sensitivity (SRS) were observed from the tensile curves of extruded Mg-5Li-3Al-1.5Zn-2RE alloy. The serrated curves were investigated by optical microscopy, step-tensile test and transmission electron microscopy. The small serrated flow is due to the traditional dynamic strain ageing. The positive SRS is caused by dynamic strain ageing. The severe Portevin Le Chatelier phenomenon and the negative SRS are attributed to a larger number of twins. Transmission electron microscope diffraction pattern reveals the {10 (1) over bar2} twin and {10 (1) over bar1} twins. (C) 2011 Elsevier B.V. All rights reserved.
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