This paper aims to investigate microstructure, corrosion behavior and mechanical properties of Mg-4Li and Mg-4Li-3Al.
The microstructure was characterized by using scanning electron microscopy and electron backscatter diffraction. The corrosion behaviors were measured by hydrogen evolution and potentiodynamic polarization tests. The mechanical properties were evaluated by tensile tests.
The addition of Al results in the precipitation of some Mg-Al phase and Al3Li phase particles, and the formation of some fine recrystallized grains.
Mg-4Li-3Al showed a higher corrosion rate than that of Mg-4Li, attributed to the precipitate particles in Mg-4Li-3Al causing microgalvanic corrosion and the change of grain orientation. The addition of 3 Wt. per cent Al increased the tensile strength by solid solution strengthening, precipitation strengthening, refinement strengthening and texture strengthening, whilst the elongation decreased by almost half.
This work is supported by a project of the National Natural Science Foundation of China (No. 51971040, 51701029, 51671041, 51531002), National Key Research and Development Program of China (2016YFB0301100), China Postdoctoral Science Foundation Funded Project (2018T110943, 2017M620410), the Chongqing Postdoctoral Scientific Research Foundation (Xm2017010) and Fundamental Research Funds for the Central Universities (2018CDGFCL005).
Zhang, C., Wu, L., Zhao, Z., Huang, G., Jiang, B., Atrens, A. and Pan, F. (2020), "Effect of Al on the microstructure, corrosion behavior and mechanical properties of Mg-4Li", Anti-Corrosion Methods and Materials, Vol. 67 No. 1, pp. 31-37. https://doi.org/10.1108/ACMM-06-2019-2146Download as .RIS
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