Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 18, Pages 5678-5684Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.04.034
Keywords
Magnesium-lithium alloys; Calcium; Grain refinement; Microstructure
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Funding
- National Natural Science Foundation of China [51001034]
- Key Project of Science and Technology of Harbin City [2008AA4CH044, 2009AA1AG065, 2010AA4BE031]
- Fundamental Research funds for the Central Universities [HEUCF101001]
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The as-cast Mg-5Li-3Al-xCa (x = 0,0.5,1,1.5 wt.%) was prepared with vacuum induction melting furnace, then processed by hot extrusion. The microstructures and tensile properties were investigated. The results show that the grains of as-cast alloys were refined gradually with the increase of Ca content from 0.5 wt.% to 1 wt.%, while the Ca content increases to 1.5 wt.%, the grain size increases. The microstructures of investigated alloys were further refined after hot extrusion. Both as-cast and as-extruded Mg-5Li-3Al-0.5Ca alloys have the highest mechanical properties, which is mainly attributed to the grain refinement caused by the addition of Ca and the formation of strengthening phase, Al4Ca. When the addition of Ca is up to 1-1.5 wt.%, the tensile properties of alloys are worsened due to the excessive (Mg, A1)(2)Ca eutectic phase forming at grain boundary. (C) 2011 Elsevier B.V. All rights reserved.
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