Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 560, Issue -, Pages 667-671Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.10.010
Keywords
Magnesium alloys; Damping; Dislocation
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Funding
- National Natural Science Foundation Commission of China [51271206]
- Program for New Century Excellent Talents in University [NCET-11-0554]
- National Key Technology RD Program [2011BAE22B04]
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This study shows that Mg-Mn alloys exhibit high strain-dependent damping values, which are much better than that of pure Mg in the high strain region. The high damping capacities of these alloys are attributed to the dislocation that connects to the dispersed alpha-Mn. However, excessive alpha-Mn creates an obstacle dislocation effect, which leads to the decrease in damping capacities because of the tangled dislocations. This conclusion is confirmed by the G-L theory and TEM images. Meanwhile, the dispersed phase hampers the increase of damping peaks of temperature-dependent damping capacities, and the a-Mn aggregate at grain boundaries can hinder them from sliding. The results of this study will be useful for the further development of high-damping Mg alloys. (C) 2012 Elsevier B.V. All rights reserved.
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