Abstract
This work studied the high-temperature oxidation resistance properties of Mg alloys with Gd and Ca. The oxidation property of Mg-3.5Gd-xCa (x = 0, 0.5, 1.0 and 3.0 wt%) alloys followed parabolic oxidation kinetics at 500 °C. A stable oxide film was formed on the alloy surface and limited further oxidation. The oxide film was composed of Gd2O3, MgO and MgCO3 for Mg-3.5Gd and was mainly CaO and CaCO3 with increasing Ca content for Mg-3.5Gd-xCa alloys. The high oxidation affinity of Ca caused it to be oxidized preferentially and the fast diffusion of Ca in Mg alloys provided a source for the continuous oxidation of Ca at the surface. The parabolic rate constant, grains size and surface roughness of the oxide film increased with the increasing Ca content in Mg-3.5Gd-xCa alloy. The understanding of multi-element alloying on the oxidation behavior of Mg alloy is helpful for the design of multi-element oxidation-resistant Mg alloys.
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Funding
This study was funded by the National Natural Science Foundation of China (51971044, 51971040 and U1910213), the Natural Science Foundation of Chongqing (cstc2019yszx-jcyjX0004), the Qinghai Provincial Science and Technology Key Program (2018-GX-A1) and the Fundamental Research Funds for the Central Universities (2020CDJDPT001). The authors also thank Karlsruhe Nano Micro Facility (KNMF), and Institute for Applied Materials (IAM) of Karlsruhe Institute of Technology (KIT) provided the characterizations. Fellowship from KIT for research guest stay of author Prof. Yuan Yuan during preparing this manuscript is greatly acknowledged. Fruitful discussion with Dr. Martin Steinbruke, KIT, during the second revision process is appreciated.
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Wu, J., Yuan, Y., Yu, X. et al. The high-temperature oxidation resistance properties of magnesium alloys alloyed with Gd and Ca. J Mater Sci 56, 8745–8761 (2021). https://doi.org/10.1007/s10853-020-05758-1
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DOI: https://doi.org/10.1007/s10853-020-05758-1