Effects of Zn and Ca Additions on Microstructure and Mechanical Properties of Mg–11Li Based Alloys
The addition of Li in amounts greater than ˜11 wt% to Mg alloys cause the crystal structure of the latter to transform to the β phase with a BCC structure. Hence, Li addition in Mg alloys can significantly improve the formability. However, Mg–Li alloys have low
strength and poor corrosion resistance, which is a drawback for their application. Various alloying elements have been added to Mg–Li alloy systems to improve their mechanical properties. In this study, the effect of Zn and Ca addition on the microstructure and mechanical properties
of the as-cast and as-extruded Mg–11Li based alloys was investigated. The alloys were cast into a steel mold, which was heated at 200 °C, at a pouring temperature of 700 °C. The cast billets were extruded at 200 °C into plates of 50 mm width and 4 mm thickness. Addition of
Zn and Ca to Mg–11Li based alloys resulted in grain refinement due to the formation of Mg2Zn3Li and Mg–Zn–Ca containing intermetallic compounds. The ultimate strength and elongation of the as-extruded Mg–11Li–0.4Ca alloy were 130 MPa and
44%, while those of the Mg–11Li–6Zn–0.4Ca alloy were 217 MPa and 42%, respectively. The combined addition of Zn and Ca resulted in improving the strength with no reduction in elongation, of Mg–11Li alloys.
Keywords: Calcium (Ca); Mechanical Properties; Mg–Li Alloy; Microstructure; Zinc (Zn)
Document Type: Research Article
Affiliations: Korea Institute of Industrial Technology, Gwangju, 61012, Korea
Publication date: 01 November 2016
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