Journal
METALS
Volume 9, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/met9111212
Keywords
Mg-7Li-3Al alloy; extrusion; mechanical properties; corrosion
Funding
- National Natural Science Foundation of China [51601024]
- National Key Research and Development Program of China [2016YFB0700403, 2016YFB0301100]
- Fundamental Research Funds for the Central Universities of china [2018CDJDCL0020, 2018CDJDCL0019, 2018CDGFCL0005]
- Ministry of Education
- State Administration of Foreign Experts Affairs of China [B16007]
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The effect of Ca addition on the microstructure, mechanical properties, and corrosion behaviors of the extruded Mg-7Li-3Al alloys was investigated. The results showed that the extruded Mg-7Li-3Al-xCa alloys consisted of alpha-Mg (hcp) + beta-Li (bcc) matrix phases and Al2Ca. With increasing Ca content, the amount and morphology of the Al2Ca phase changed significantly. The grains of the extruded Mg-7Li-3Al-xCa alloys were refined by dynamic recrystallization during the extrusion process. The tensile tests results indicated that the extruded Mg-7Li-3Al-0.4Ca alloy exhibited favorable comprehensive mechanical properties; its ultimate tensile strength was 286 MPa, the yield strength was 249 MPa, and the elongation was 18.7%. The corrosion results showed that this alloy with 0.4 wt.% Ca addition exhibited superior corrosion resistance, with a corrosion potential E-corr of -1.48742 V-VSE, attributed to the formation of protective Al2Ca phases.
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