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Microstructure and corrosion behavior of as-extruded Mg-6.5Li-xY-yZn alloys
- Source :
- Journal of Alloys and Compounds. 823:153839
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- The as-cast Mg-6.5Li-xY-yZn alloys (Mg-6.5Li-0.8Y, Mg-6.5Li-0.8Y-0.3Zn and Mg-6.5Li-1.0Y-1.0Zn) were extruded at 553 K with an extrusion ratio of 25:1 and a constant extrusion speed of 1.6 mm/s. The microstructure and corrosion behavior of as-extruded Mg-6.5Li-xY-yZn alloys were studied by microstructure observation, weight loss test, hydrogen evolution test and electrochemical test in present work. The microstructure shows that the Mg-6.5Li-0.8Y alloy contains α-Mg, β-Li and Mg2Y phase, the Mg-6.5Li-0.8Y-0.3Zn alloy is composed of α-Mg, β-Li and X phase (Mg12ZnY, LPSO phase) and the Mg-6.5Li-1.0Y-1.0Zn alloy consists of α-Mg, β-Li and W phase (Mg3Zn3Y2). The corrosion results indicate that the combining addition of Y and Zn can improve the corrosion resistance of Mg-6.5Li alloys and Mg-6.5Li-0.8Y-0.3Zn alloy with LPSO phase possesses the best corrosion resistance. The surface microstructure of test alloys after immersed in 3.5 wt% NaCl solution for 48 h, showing that the Mg-6.5Li-0.8Y alloy has the most corrosion pits while the Mg-6.5Li-0.8Y-0.3Zn alloy has the least corrosion pits due to the minimal micro-galvanic formed on its surface.
- Subjects :
- Materials science
Mechanical Engineering
Metallurgy
Alloy
Metals and Alloys
02 engineering and technology
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
Microstructure
01 natural sciences
0104 chemical sciences
Corrosion
Mechanics of Materials
Phase (matter)
Materials Chemistry
engineering
Extrusion
Hydrogen evolution
0210 nano-technology
Corrosion behavior
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 823
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........5b62a9f032819186ae601452369b0614