Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 664, Issue -, Pages 43-48Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.03.125
Keywords
Magnesium alloys; Dynamic mechanical properties; Dislocation; Twinning; Strain hardening
Categories
Funding
- National Natural Science Foundation of China [51525101, 51501032, 51171043, 51371046]
- National 863 High-Tech Project [2013AA031601]
- Changjiang Scholars and Innovative Research Team in University [IRT0713]
- Program for New Century Excellent Talents in University [NECT-12-0109]
- Fundamental Research Funds for the Central Universities [N130510002, N141003001, L1502025, L1502047]
- China Postdoctoral Science Foundation [2015M581350]
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To further understand the deformation mechanism of magnesium alloys and expand their applications under dynamic conditions, the newly developed Mg-2Sn-1Ca alloy (TX21) is selected as the representative sample and tested under wide loading rate ranging from quasi-static to dynamic level (10(-3) -500/s). Both ultimate tensile strength and elongation of the as-extruded TX21 alloys increase with strain rate. Although twinning is accompanied due to the enhanced activity at higher strain rate, the preferential activation of dislocations is readily clarified and confirmed as the dominant deformation modes. Active interactions of pyramidal dislocations result in the higher strain hardening ability and could be correlated to the obviously positive strain-rate sensitivity for mechanical properties. Moreover, it is observed that the larger grain size and higher content of solute atoms dissolved in matrix would lead to the more active dislocations and twinning formations. The present results would provide insight into further understanding the deformation mechanism under dynamic rate loading and designing Mg alloy suitable for impact conditions. (C) 2016 Elsevier B.V. All rights reserved.
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