Abstract: Mg-8Li-5Al-5Ca with high ratio of calcium and aluminum was designed. Its mechanical properties at room temperature and corrosion resistance were studied by the room temperature tensile test, weight loss method, pH tests and electrochemical tests. Also, microstructure and corrosion morphology of the alloy were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that a structure of double matrix (α-Mg+β-Li) surrounded with Al2Ca phases was formed in the Mg-8Li-5Al-5Ca alloy, and both the matrix and the second phases were obviously refined after hot extrusion. The corrosion resistance was improved compared with that of the common Mg-Li alloys. Coordinating the excellent plasticity of Mg-Li alloys and high strength of the magnesium alloys with high ratio of calcium and aluminum, the Mg-8Li-5Al-5Ca alloy had high tensile strength (222 MPa) and elongation (8.3%).
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2017, Vol. 31 
